File di riferimento rimossi con il task, immagini animate rifiutate, filtro production_run_id (#43)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/backend/api/routers/vision.py

@@ -4,7 +4,10 @@ It does not know, and must not know, whether the server or the station computed
 the numbers: that is what lets a station's configuration change without touching
 the frontend or the recipes.
 """
+import io
+
 from fastapi import APIRouter, Depends, File, Form, HTTPException, UploadFile, status
+from PIL import Image
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
@@ -90,9 +93,27 @@ async def _read_image(image: UploadFile) -> bytes:
             status_code=status.HTTP_422_UNPROCESSABLE_CONTENT,
             detail="the file's content does not match a supported image format",
         )
+    _reject_animated(content)
     return content
 
 
+def _reject_animated(content: bytes) -> None:
+    """Animated GIF/WebP/APNG have no single frame to measure (decision of
+    06/10/2026, #43): refuse them instead of silently reading frame 0."""
+    try:
+        with Image.open(io.BytesIO(content)) as img:
+            animated = getattr(img, "is_animated", False) or getattr(img, "n_frames", 1) > 1
+    except Exception:
+        # Unreadable here is not this check's business: the magic bytes passed
+        # and the worker decides what it can decode.
+        return
+    if animated:
+        raise HTTPException(
+            status_code=status.HTTP_422_UNPROCESSABLE_CONTENT,
+            detail="animated images are not supported",
+        )
+
+
 @router.post("/execute", response_model=VisionExecuteResponse)
 async def execute(
     task_id: int = Form(...),