feat: add storyboard script rewriting

api/main.py

@@ -2618,17 +2618,22 @@ def translate_text(req: TranslateReq) -> dict:
 
 
 def _fallback_script_rewrite_item(segment: ScriptRewriteSegmentReq, author_intent: str = "") -> dict:
-    text = (segment.current_text or "").strip()
     source = (segment.source or "").strip()
     intent = (author_intent or "").strip()
-    if text:
-        rewritten = text
-    elif source:
-        rewritten = f"这一段按原片节奏切到 SKG 肩颈按摩仪，把{source[:28]}转成肩颈放松场景。"
-    else:
-        rewritten = "这一段延续原片节奏，把画面和口播落到 SKG 肩颈放松体验。"
-    if intent and intent not in rewritten:
-        rewritten = f"{rewritten} {intent[:48]}"
+    role = segment.role or ""
+    templates = {
+        "开场钩子": "你有没有发现，低头久了以后，脖子和肩膀会先替你喊累。",
+        "痛点推进": "刷手机、坐电脑、赶通勤叠在一起，肩颈很容易一直绷着放不下来。",
+        "利益证明": "SKG 这种挂脖按摩仪，重点就是贴住肩颈位置，把热敷感和揉按感带到真正紧的地方。",
+        "方案过渡": "这一段可以直接拍拿起、戴上、贴合，让产品自然进入日常放松场景。",
+        "转化收口": "如果你也想把肩颈放松变成每天的小习惯，可以从这台 SKG 开始。",
+        "节奏承接": "顺着原片节奏，把这一句落到一个具体的肩颈使用场景里。",
+    }
+    rewritten = templates.get(role, templates["节奏承接"])
+    if source and role not in {"开场钩子", "转化收口"}:
+        rewritten = f"{rewritten} 原片这一句的节奏可以保留，但内容换成 SKG 的佩戴和放松体验。"
+    if intent:
+        rewritten = f"{rewritten} 语气按作者想法处理：{intent[:44]}。"
     return {"index": segment.index, "text": rewritten[:220]}
 
 
@@ -2695,21 +2700,31 @@ def _rewrite_storyboard_script_sync(req: RewriteStoryboardScriptReq) -> list[dic
         + json.dumps(payload, ensure_ascii=False)
         + '\n\n只输出严格 JSON：{"items":[{"index":0,"text":"改写后的中文口播"}]}'
     )
-    try:
-        resp = llm().chat.completions.create(
-            model=AUDIO_REWRITE_MODEL,
-            messages=[
-                {"role": "system", "content": "只返回合法 JSON，不要 markdown，不要解释。"},
-                {"role": "user", "content": prompt},
-            ],
-            response_format={"type": "json_object"},
-            temperature=0.68 if req.mode == "all" else 0.62,
-            max_tokens=max(900, min(5000, 180 * len(segments) + 500)),
-        )
-        raw = (resp.choices[0].message.content or "").strip()
-        return _parse_script_rewrite_items(raw, segments, author_intent)
-    except Exception:
-        return [_fallback_script_rewrite_item(segment, author_intent) for segment in segments]
+    models = []
+    for model in [AUDIO_REWRITE_MODEL, ASR_FALLBACK_MODEL, TRANSLATE_MODEL]:
+        if model and model not in models:
+            models.append(model)
+    for model in models:
+        try:
+            resp = llm().chat.completions.create(
+                model=model,
+                messages=[
+                    {"role": "system", "content": "只返回合法 JSON，不要 markdown，不要解释。"},
+                    {"role": "user", "content": prompt},
+                ],
+                response_format={"type": "json_object"},
+                temperature=0.68 if req.mode == "all" else 0.62,
+                max_tokens=max(900, min(5000, 180 * len(segments) + 500)),
+            )
+            message = resp.choices[0].message
+            raw = (message.content or getattr(message, "reasoning_content", "") or "").strip()
+            items = _parse_script_rewrite_items(raw, segments, author_intent)
+            if any((item.get("text") or "").strip() for item in items):
+                return items
+        except Exception as e:
+            print(f"[script rewrite fallback] {model}: {e}", flush=True)
+            continue
+    return [_fallback_script_rewrite_item(segment, author_intent) for segment in segments]
 
 
 @app.post("/jobs/{job_id}/script/rewrite")