feat(task3): migrate toolchain to oxfmt + oxlint

- Install oxfmt with .oxfmtrc.json (maps Prettier config)
- Install oxlint with oxlint.config.ts (TypeScript + React rules)
- Replace admin ESLint with oxlint
- Remove Prettier integration from server ESLint (keep ESLint for type checking)
- Delete server .prettierrc and admin eslint.config.js

apps/admin/package.json

@@ -6,7 +6,8 @@
   "scripts": {
     "dev": "vite",
     "build": "tsc -b && vite build",
-    "lint": "eslint .",
+    "lint": "oxlint --config ../../oxlint.config.ts",
+    "format": "oxfmt",
     "preview": "vite preview"
   },
   "dependencies": {
@@ -22,17 +23,11 @@
     "tslib": "^2.8.1"
   },
   "devDependencies": {
-    "@eslint/js": "^9.39.4",
     "@types/node": "^24.12.2",
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",
     "@vitejs/plugin-react": "^6.0.1",
-    "eslint": "^9.39.4",
-    "eslint-plugin-react-hooks": "^7.1.1",
-    "eslint-plugin-react-refresh": "^0.5.2",
-    "globals": "^17.5.0",
     "typescript": "~6.0.2",
-    "typescript-eslint": "^8.58.2",
     "vite": "^8.0.9"
   }
 }