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-lock.json

@@ -27,12 +27,12 @@
         "@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"
       }
     },
     "node_modules/@alloc/quick-lru": {