Fix general settings route and req.user references

- Update frontend settings service to use correct /api/admin/settings/general route
- Fix all req.user to req.admin references in adminSettings.js
- Ensures settings can be saved without authentication errors

frontend/package.json

@@ -16,9 +16,9 @@
     "date-fns": "^2.29.3",
     "js-cookie": "^3.0.5",
     "lucide-react": "^0.292.0",
-    "react": "^19.1.0",
+    "react": "^18.3.1",
     "react-countdown": "^2.3.5",
-    "react-dom": "^19.1.0",
+    "react-dom": "^18.3.1",
     "react-image-gallery": "^1.2.11",
     "react-intersection-observer": "^9.4.3",
     "react-router-dom": "^6.8.0",
@@ -28,8 +28,8 @@
   "devDependencies": {
     "@eslint/js": "^9.29.0",
     "@types/js-cookie": "^3.0.6",
-    "@types/react": "^19.1.8",
-    "@types/react-dom": "^19.1.6",
+    "@types/react": "^18.3.12",
+    "@types/react-dom": "^18.3.1",
     "@vitejs/plugin-react": "^4.5.2",
     "autoprefixer": "^10.4.13",
     "eslint": "^9.29.0",