mobile2: Casdoor OIDC auth deployment

- New branch for mobile2.falah-os.com with Casdoor OIDC
- Auth page with 'Sign in with Casdoor' button
- OIDC callback: exchanges code via server-side API route
- env vars configured on Netlify
- DNS auto-configured via Netlify (falah-os.com zone)

package.json

@@ -28,11 +28,11 @@
     "@netlify/plugin-nextjs": "^5.15.12",
     "@tailwindcss/postcss": "^4.3.1",
     "@types/node": "^20",
-    "@types/react": "^19",
+    "@types/react": "19.2.17",
     "@types/react-dom": "^19",
     "eslint": "^9",
     "eslint-config-next": "16.2.7",
     "tailwindcss": "^4.3.1",
-    "typescript": "^5"
+    "typescript": "5.9.3"
   }
 }