fix: WeasyPrint URL fetcher + attachment improvements + webhook error propagation + WebSocket conversation check + RLS disabled on system tables (bootstrap fix)

app/routes/attachments.py

@@ -94,13 +94,19 @@ async def download_attachment(
         raise HTTPException(404, detail={"detail": "Attachment not found", "code": "not_found"})
 
     file_path = data["file_path"]
-    if not os.path.isfile(file_path):
-        raise HTTPException(404, detail={"detail": "File not found on disk", "code": "file_missing"})
+    # Use storage backend instead of os.path.isfile (P1.1 fix)
+    from app.core.storage import get_storage_backend
+    storage = get_storage_backend()
+    try:
+        file_bytes = await storage.load(file_path)
+    except Exception:
+        raise HTTPException(404, detail={"detail": "File not found in storage", "code": "file_missing"})
 
-    return FileResponse(
-        path=file_path,
-        filename=data["filename"],
+    from fastapi.responses import Response
+    return Response(
+        content=file_bytes,
         media_type=data["mime_type"],
+        headers={"Content-Disposition": f'attachment; filename="{data["filename"]}"'},
     )