fix: enforce orthographic top bottom subject views

api/main.py

@@ -2641,8 +2641,8 @@ SUBJECT_VIEW_LABELS: dict[str, str] = {
     "three_quarter_right": "右前 45°",
     "side": "侧面",
     "side_walk": "侧面走路",
-    "top": "顶部视角",
-    "bottom": "底部视角",
+    "top": "正投影俯视图",
+    "bottom": "正投影仰视图",
     "expression_neutral": "中性表情",
     "expression_smile": "微笑表情",
     "expression_happy": "开心表情",
@@ -2691,11 +2691,27 @@ def _subject_view_labels(kind: SubjectKind, requested: list[str] | None = None)
         ("back", "背面"),
         ("left", "左侧"),
         ("right", "右侧"),
-        ("top", "顶部"),
-        ("bottom", "底部"),
+        ("top", "正投影俯视图"),
+        ("bottom", "正投影仰视图"),
     ]
 
 
+def _subject_view_projection_clause(view: str) -> str:
+    if view == "top":
+        return (
+            "Patent-style orthographic top view: look straight down from directly above the product, "
+            "with the viewing direction perpendicular to the top face. No perspective, no tilt, no 3/4 angle, "
+            "no oblique overhead camera, no visible front/side depth unless it is true product thickness in orthographic projection. "
+        )
+    if view == "bottom":
+        return (
+            "Patent-style orthographic bottom view: look straight up at the underside/bottom face, "
+            "with the viewing direction perpendicular to the bottom face. No perspective, no tilt, no 3/4 angle, "
+            "no low-angle perspective camera, no visible front/side depth unless it is true product thickness in orthographic projection. "
+        )
+    return ""
+
+
 def _attach_temporal_metrics(items: list[dict]) -> None:
     """相邻低清帧差异：转场 / 动作目标依赖它，不需要逐帧高分辨率扫描。"""
     for i, it in enumerate(items):
@@ -6910,11 +6926,13 @@ def _generate_subject_assets_sync(job_id: str, idx: int, element_id: str, req: G
             else:
                 view_prompt = f"complete object/product reference, {view_label} view"
             view_name = view.replace("_", " ")
+            projection_clause = _subject_view_projection_clause(view)
             single_view_clause = (
                 f"Single-image output rule: this output file is ONLY for the {view_label} view ({view_name}). "
                 "Render exactly one subject, one time, in one pose and one camera angle. "
                 "Do not create a multi-view sheet, contact sheet, grid, storyboard, lineup, comparison layout, before/after layout, mirrored pair, duplicate subjects, thumbnails, labels, captions, arrows, view names, panel borders, or multiple versions in the same image. "
                 "Do not include any other views in this image. "
+                + projection_clause
             )
             framing_clause = (
                 "For this close-up view, intentionally crop as an upper-body asset from head/neck to chest or upper back; the neck, shoulders, collarbone or upper spine area must be large, clear, and useful for placing a neck-and-shoulder massage device. "