diff --git a/.memory/worklog.json b/.memory/worklog.json
index 6808885..2702693 100644
--- a/.memory/worklog.json
+++ b/.memory/worklog.json
@@ -1,40 +1,5 @@
 {
   "entries": [
-    {
-      "files_changed": 1,
-      "hash": "2a259cc",
-      "message": "auto-save 2026-05-16 14:57 (~1)",
-      "ts": "2026-05-16T14:57:39+08:00",
-      "type": "commit"
-    },
-    {
-      "files_changed": 1,
-      "hash": "b491624",
-      "message": "auto-save 2026-05-16 15:03 (~1)",
-      "ts": "2026-05-16T15:03:25+08:00",
-      "type": "commit"
-    },
-    {
-      "files_changed": 1,
-      "hash": "6c09899",
-      "message": "auto-save 2026-05-16 15:09 (~1)",
-      "ts": "2026-05-16T15:09:12+08:00",
-      "type": "commit"
-    },
-    {
-      "files_changed": 1,
-      "hash": "a3f5544",
-      "message": "auto-save 2026-05-16 15:14 (~1)",
-      "ts": "2026-05-16T15:14:56+08:00",
-      "type": "commit"
-    },
-    {
-      "files_changed": 1,
-      "hash": "f06e55f",
-      "message": "auto-save 2026-05-16 15:20 (~1)",
-      "ts": "2026-05-16T15:20:41+08:00",
-      "type": "commit"
-    },
     {
       "files_changed": 1,
       "hash": "0abb1a2",
@@ -3217,6 +3182,38 @@
       "message": "auto-save 2026-05-18 20:13 (~3)",
       "hash": "69bb692",
       "files_changed": 3
+    },
+    {
+      "ts": "2026-05-18T20:19:24+08:00",
+      "type": "commit",
+      "message": "auto-save 2026-05-18 20:19 (~2)",
+      "hash": "b886e02",
+      "files_changed": 2
+    },
+    {
+      "ts": "2026-05-18T12:22:20Z",
+      "type": "session-heartbeat",
+      "message": "Codex 会话活跃 · 最近命令：codex · 分支 main · 2 项未提交变更 · 最近提交：auto-save 2026-05-18 20:19 (~2)",
+      "files_changed": 2
+    },
+    {
+      "ts": "2026-05-18T20:23:21+08:00",
+      "type": "commit",
+      "message": "docs: document skg brand workbench theme",
+      "hash": "2e2998c",
+      "files_changed": 1
+    },
+    {
+      "ts": "2026-05-18T12:32:20Z",
+      "type": "session-heartbeat",
+      "message": "Codex 会话活跃 · 最近命令：codex · 分支 main · 1 项未提交变更 · 最近提交：docs: document skg brand workbench theme",
+      "files_changed": 1
+    },
+    {
+      "ts": "2026-05-18T12:42:20Z",
+      "type": "session-heartbeat",
+      "message": "Codex 会话活跃 · 最近命令：codex · 分支 main · 1 项未提交变更 · 最近提交：docs: document skg brand workbench theme",
+      "files_changed": 1
     }
   ]
 }
diff --git a/api/main.py b/api/main.py
index 45dad7a..5b9a4be 100644
--- a/api/main.py
+++ b/api/main.py
@@ -20,7 +20,7 @@ from typing import Literal
 
 import httpx
 from dotenv import load_dotenv
-from fastapi import BackgroundTasks, FastAPI, File, HTTPException, Request, Response, UploadFile
+from fastapi import BackgroundTasks, FastAPI, File, Form, HTTPException, Request, Response, UploadFile
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import FileResponse
 from pydantic import BaseModel, Field
@@ -42,6 +42,19 @@ SUBJECT_TEMPLATE_DIR = Path(os.getenv("SUBJECT_TEMPLATE_DIR", JOBS_DIR / "_subje
 SUBJECT_TEMPLATE_IMAGE_DIR = SUBJECT_TEMPLATE_DIR / "images"
 SUBJECT_TEMPLATE_MANIFEST = SUBJECT_TEMPLATE_DIR / "manifest.json"
 SUBJECT_TEMPLATE_IMAGE_DIR.mkdir(parents=True, exist_ok=True)
+ASSET_LIBRARY_DIR = Path(os.getenv("ASSET_LIBRARY_DIR", JOBS_DIR.parent / "asset_library")).resolve()
+PROMPT_LIBRARY_DIR = Path(os.getenv("PROMPT_LIBRARY_DIR", JOBS_DIR.parent / "prompt_library")).resolve()
+PROMPT_LIBRARY_ITEMS_DIR = PROMPT_LIBRARY_DIR / "items"
+LIBRARY_TRASH_DIR = JOBS_DIR.parent / "_trash"
+for _library_dir in [
+    ASSET_LIBRARY_DIR / "subjects",
+    ASSET_LIBRARY_DIR / "products",
+    ASSET_LIBRARY_DIR / "scenes",
+    ASSET_LIBRARY_DIR / "videos",
+    PROMPT_LIBRARY_ITEMS_DIR,
+    LIBRARY_TRASH_DIR,
+]:
+    _library_dir.mkdir(parents=True, exist_ok=True)
 
 LLM_BASE_URL = os.getenv("LLM_BASE_URL", "").strip()
 LLM_API_KEY = os.getenv("LLM_API_KEY", "").strip()
@@ -493,6 +506,93 @@ class SubjectTemplateItem(BaseModel):
     updated_at: float = 0.0
 
 
+PromptLibraryCategory = Literal["scene_desc", "video_desc", "subject_desc", "skg_script", "product_angle"]
+AssetLibraryKind = Literal["subjects", "products", "scenes", "videos"]
+
+
+class PromptLibraryItem(BaseModel):
+    id: str
+    category: PromptLibraryCategory
+    name: str
+    tags: list[str] = Field(default_factory=list)
+    prompt_en: str = ""
+    prompt_zh: str = ""
+    use_count: int = 0
+    source_job_id: str = ""
+    created_at: float = 0.0
+    updated_at: float = 0.0
+
+
+class PromptLibraryWriteReq(BaseModel):
+    category: PromptLibraryCategory
+    name: str
+    tags: list[str] = Field(default_factory=list)
+    prompt_en: str = ""
+    prompt_zh: str = ""
+    source_job_id: str = ""
+
+
+class PromptLibraryPatchReq(BaseModel):
+    category: PromptLibraryCategory | None = None
+    name: str | None = None
+    tags: list[str] | None = None
+    prompt_en: str | None = None
+    prompt_zh: str | None = None
+    source_job_id: str | None = None
+
+
+class AssetLibraryImage(BaseModel):
+    id: str
+    view: str = ""
+    label: str = ""
+    filename: str
+    url: str = ""
+    width: int = 0
+    height: int = 0
+    created_at: float = 0.0
+
+
+class AssetLibraryItem(BaseModel):
+    id: str
+    kind: AssetLibraryKind
+    name: str
+    name_zh: str = ""
+    note: str = ""
+    tags: list[str] = Field(default_factory=list)
+    source_job_id: str = ""
+    use_count: int = 0
+    created_at: float = 0.0
+    updated_at: float = 0.0
+    is_official: bool = False
+    prompt_brief: str = ""
+    prompt_brief_zh: str = ""
+    subject_style: Literal["transparent_human", "source_actor"] = "transparent_human"
+    product_type: str = ""
+    views: list[AssetLibraryImage] = Field(default_factory=list)
+    images: list[AssetLibraryImage] = Field(default_factory=list)
+    asset_role: str = ""
+    aspect_ratio: str = ""
+    image: AssetLibraryImage | None = None
+    duration: float = 0.0
+    poster: AssetLibraryImage | None = None
+    video_url: str = ""
+
+
+class AssetLibraryPatchReq(BaseModel):
+    name: str | None = None
+    name_zh: str | None = None
+    note: str | None = None
+    tags: list[str] | None = None
+    source_job_id: str | None = None
+    prompt_brief: str | None = None
+    prompt_brief_zh: str | None = None
+    subject_style: Literal["transparent_human", "source_actor"] | None = None
+    product_type: str | None = None
+    asset_role: str | None = None
+    aspect_ratio: str | None = None
+    is_official: bool | None = None
+
+
 class ProductFusionRegion(BaseModel):
     x: float = 0
     y: float = 0
@@ -890,6 +990,267 @@ def subject_template_image_file(filename: str) -> Path:
     return p
 
 
+def _now_ts() -> float:
+    return time.time()
+
+
+def _safe_tags(value: object) -> list[str]:
+    if not isinstance(value, list):
+        return []
+    return [str(item).strip() for item in value if str(item).strip()][:20]
+
+
+def _library_media_size(path: Path) -> tuple[int, int]:
+    try:
+        with Image.open(path) as im:
+            return im.width, im.height
+    except Exception:
+        return 0, 0
+
+
+def _library_kind_dir(kind: AssetLibraryKind | str) -> Path:
+    if kind not in {"subjects", "products", "scenes", "videos"}:
+        raise HTTPException(404, "asset library kind not found")
+    return ASSET_LIBRARY_DIR / str(kind)
+
+
+def _asset_library_item_dir(kind: AssetLibraryKind | str, item_id: str) -> Path:
+    item_id = item_id.strip()
+    if not item_id or "/" in item_id or ".." in item_id:
+        raise HTTPException(400, "invalid asset library id")
+    return _library_kind_dir(kind) / item_id
+
+
+def _prompt_library_item_path(item_id: str) -> Path:
+    item_id = item_id.strip()
+    if not item_id or "/" in item_id or ".." in item_id:
+        raise HTTPException(400, "invalid prompt library id")
+    return PROMPT_LIBRARY_ITEMS_DIR / f"{item_id}.json"
+
+
+def _prompt_item_file(item: PromptLibraryItem) -> Path:
+    return _prompt_library_item_path(item.id)
+
+
+def _asset_item_file(item: AssetLibraryItem) -> Path:
+    return _asset_library_item_dir(item.kind, item.id) / "manifest.json"
+
+
+def _write_prompt_item(item: PromptLibraryItem) -> None:
+    PROMPT_LIBRARY_ITEMS_DIR.mkdir(parents=True, exist_ok=True)
+    _prompt_item_file(item).write_text(item.model_dump_json(indent=2), encoding="utf-8")
+    _write_prompt_library_index()
+
+
+def _write_asset_item(item: AssetLibraryItem) -> None:
+    p = _asset_item_file(item)
+    p.parent.mkdir(parents=True, exist_ok=True)
+    p.write_text(item.model_dump_json(indent=2), encoding="utf-8")
+    _write_asset_library_index()
+
+
+def _read_prompt_item(path: Path) -> PromptLibraryItem | None:
+    try:
+        return PromptLibraryItem.model_validate_json(path.read_text(encoding="utf-8"))
+    except Exception:
+        return None
+
+
+def _read_asset_item(path: Path) -> AssetLibraryItem | None:
+    try:
+        item = AssetLibraryItem.model_validate_json(path.read_text(encoding="utf-8"))
+        _hydrate_asset_library_urls(item)
+        return item
+    except Exception:
+        return None
+
+
+def load_prompt_library_items() -> list[PromptLibraryItem]:
+    items = [_read_prompt_item(path) for path in PROMPT_LIBRARY_ITEMS_DIR.glob("*.json")]
+    result = [item for item in items if item]
+    result.sort(key=lambda item: item.updated_at or item.created_at, reverse=True)
+    return result
+
+
+def load_asset_library_items(kind: AssetLibraryKind | str | None = None) -> list[AssetLibraryItem]:
+    kinds = [kind] if kind else ["subjects", "products", "scenes", "videos"]
+    items: list[AssetLibraryItem] = []
+    for current in kinds:
+        root = _library_kind_dir(str(current))
+        for manifest in root.glob("*/manifest.json"):
+            item = _read_asset_item(manifest)
+            if item:
+                items.append(item)
+    items.sort(key=lambda item: item.updated_at or item.created_at, reverse=True)
+    return items
+
+
+def _write_prompt_library_index() -> None:
+    PROMPT_LIBRARY_DIR.mkdir(parents=True, exist_ok=True)
+    items = [item.model_dump() for item in load_prompt_library_items()]
+    (PROMPT_LIBRARY_DIR / "index.json").write_text(json.dumps({"items": items}, ensure_ascii=False, indent=2), encoding="utf-8")
+
+
+def _write_asset_library_index() -> None:
+    ASSET_LIBRARY_DIR.mkdir(parents=True, exist_ok=True)
+    items = [item.model_dump() for item in load_asset_library_items()]
+    (ASSET_LIBRARY_DIR / "index.json").write_text(json.dumps({"items": items}, ensure_ascii=False, indent=2), encoding="utf-8")
+
+
+def _rebuild_library_index() -> None:
+    _write_prompt_library_index()
+    _write_asset_library_index()
+
+
+def _hydrate_asset_library_urls(item: AssetLibraryItem) -> None:
+    for image in item.images:
+        image.url = f"/asset-library/{item.kind}/{item.id}/file/{image.filename}"
+    for image in item.views:
+        image.url = f"/asset-library/{item.kind}/{item.id}/file/{image.filename}"
+    if item.image:
+        item.image.url = f"/asset-library/{item.kind}/{item.id}/file/{item.image.filename}"
+    if item.poster:
+        item.poster.url = f"/asset-library/{item.kind}/{item.id}/file/{item.poster.filename}"
+    if item.kind == "videos":
+        item.video_url = f"/asset-library/videos/{item.id}/file/video.mp4"
+
+
+def find_prompt_library_item(item_id: str) -> PromptLibraryItem:
+    item = _read_prompt_item(_prompt_library_item_path(item_id))
+    if not item:
+        raise HTTPException(404, "prompt library item not found")
+    return item
+
+
+def find_asset_library_item(kind: AssetLibraryKind | str, item_id: str) -> AssetLibraryItem:
+    item = _read_asset_item(_asset_library_item_dir(kind, item_id) / "manifest.json")
+    if not item:
+        raise HTTPException(404, "asset library item not found")
+    return item
+
+
+def _library_item_file_path(item: AssetLibraryItem, filename: str) -> Path:
+    filename = filename.strip().lstrip("/")
+    base = _asset_library_item_dir(item.kind, item.id).resolve()
+    p = (base / filename).resolve()
+    try:
+        p.relative_to(base)
+    except ValueError:
+        raise HTTPException(400, "invalid library file path")
+    if not p.exists():
+        raise HTTPException(404, "library file not found")
+    return p
+
+
+def _asset_library_search(items: list[AssetLibraryItem], q: str) -> list[AssetLibraryItem]:
+    needle = q.strip().lower()
+    if not needle:
+        return items
+    return [
+        item for item in items
+        if needle in " ".join([
+            item.name,
+            item.name_zh,
+            item.note,
+            item.prompt_brief,
+            item.prompt_brief_zh,
+            item.product_type,
+            item.asset_role,
+            " ".join(item.tags),
+        ]).lower()
+    ]
+
+
+def _prompt_library_search(items: list[PromptLibraryItem], q: str) -> list[PromptLibraryItem]:
+    needle = q.strip().lower()
+    if not needle:
+        return items
+    return [
+        item for item in items
+        if needle in " ".join([item.name, item.prompt_en, item.prompt_zh, " ".join(item.tags)]).lower()
+    ]
+
+
+def _library_ref_usage(kind: str, item_id: str) -> dict:
+    refs: set[str] = set()
+    library_kinds = {
+        "subjects": "library_subject",
+        "products": "library_product",
+        "scenes": "library_scene",
+        "videos": "library_video",
+    }
+    token = item_id
+    ref_kind = library_kinds.get(kind, "")
+    for job_id, job in JOBS.items():
+        raw = job.model_dump_json()
+        if token in raw and (not ref_kind or ref_kind in raw):
+            refs.add(job_id)
+    for state_path in JOBS_DIR.glob("*/state.json"):
+        if state_path.parent.name in refs:
+            continue
+        try:
+            raw = state_path.read_text(encoding="utf-8")
+        except Exception:
+            continue
+        if token in raw and (not ref_kind or ref_kind in raw):
+            refs.add(state_path.parent.name)
+    return {"count": len(refs), "jobs": sorted(refs)}
+
+
+def _copy_library_file_to_job(src: Path, job_id: str, label: str = "") -> dict:
+    if job_id not in JOBS:
+        raise HTTPException(404, "job not found")
+    asset_id = f"asset_{uuid.uuid4().hex[:12]}"
+    out_dir = job_dir(job_id) / "assets"
+    out_dir.mkdir(parents=True, exist_ok=True)
+    out = out_dir / f"{asset_id}.jpg"
+    if src.suffix.lower() in {".jpg", ".jpeg", ".png", ".webp"}:
+        try:
+            with Image.open(src) as im:
+                im.convert("RGB").save(out, "JPEG", quality=94)
+        except Exception:
+            shutil.copy2(src, out)
+    else:
+        shutil.copy2(src, out)
+    width, height = _library_media_size(out)
+    return {
+        "kind": "asset",
+        "frame_idx": -1,
+        "element_id": asset_id,
+        "cutout_id": asset_id,
+        "label": label,
+        "asset_meta": {"width": width, "height": height, "standard": "library-copy"},
+    }
+
+
+def _copy_library_to_job(kind: AssetLibraryKind | str, item_id: str, job_id: str) -> dict:
+    item = find_asset_library_item(kind, item_id)
+    item_dir = _asset_library_item_dir(kind, item_id)
+    if item.kind == "videos":
+        if job_id not in JOBS:
+            raise HTTPException(404, "job not found")
+        src = item_dir / "video.mp4"
+        if not src.exists():
+            raise HTTPException(404, "library video missing")
+        out_dir = job_dir(job_id) / "storyboard-videos"
+        out_dir.mkdir(parents=True, exist_ok=True)
+        video_id = f"library_{uuid.uuid4().hex[:12]}"
+        out = out_dir / f"{video_id}.mp4"
+        shutil.copy2(src, out)
+        item.use_count += 1
+        item.updated_at = _now_ts()
+        _write_asset_item(item)
+        return {"kind": "video", "video_id": video_id, "url": f"/jobs/{job_id}/storyboard-videos/{video_id}.mp4", "label": item.name}
+    image = item.image or item.poster or next(iter(item.views or item.images), None)
+    if not image:
+        raise HTTPException(404, "library image missing")
+    result = _copy_library_file_to_job(item_dir / image.filename, job_id, item.name)
+    item.use_count += 1
+    item.updated_at = _now_ts()
+    _write_asset_item(item)
+    return result
+
+
 def storyboard_ref_url(job_id: str, ref: dict | None) -> str:
     if not ref:
         return ""
@@ -905,6 +1266,8 @@ def storyboard_ref_url(job_id: str, ref: dict | None) -> str:
         return f"/jobs/{job_id}/frames/{int(frame_idx)}/elements/{element_id}/cutout.jpg"
     if kind == "asset" and ref.get("element_id"):
         return f"/jobs/{job_id}/assets/{ref.get('element_id')}.jpg"
+    if kind in {"library_subject", "library_product", "library_scene"}:
+        return ""
     return ""
 
 
@@ -936,6 +1299,10 @@ def update_generated_video(job_id: str, video_id: str, **kw) -> None:
 
 @asynccontextmanager
 async def lifespan(_: FastAPI):
+    try:
+        _rebuild_library_index()
+    except Exception as e:
+        print(f"[resource library] index rebuild failed: {e}", flush=True)
     # 启动时从磁盘恢复 jobs（简化版：只列目录）
     for p in JOBS_DIR.iterdir():
         if p.is_dir() and (p / "state.json").exists():