feat: detail page attachments, preview, and file metadata

Add file displayName/sortOrder APIs, result preview with Excel/video support,
unified attachment/link editing, feedback modal, and AuthProvider fix.
Run prisma migrate deploy on Render builds.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/package.json

@@ -18,6 +18,7 @@
     "react-dom": "^18.3.0",
     "react-router-dom": "^6.26.0",
     "socket.io-client": "^4.8.0",
+    "xlsx": "^0.18.5",
     "zustand": "^5.0.0"
   },
   "devDependencies": {