fix(ci): fix eslint compatibility, downgrade to v8, and fix lint errors

package.json

@@ -8,7 +8,7 @@
     "dev:next": "next dev",
     "build": "next build",
     "start": "next start",
-    "lint": "eslint .",
+    "lint": "eslint app components lib scripts",
     "test": "vitest",
     "prepare": "husky",
     "directus:bootstrap": "DIRECTUS_URL=http://localhost:8055 npx tsx --env-file=.env scripts/setup-directus.ts",
@@ -55,8 +55,8 @@
     "@types/react-dom": "^19.2.3",
     "@vitejs/plugin-react": "^5.1.2",
     "autoprefixer": "^10.4.23",
-    "eslint": "^9.39.2",
-    "eslint-config-next": "^16.1.6",
+    "eslint": "^8.57.1",
+    "eslint-config-next": "15.1.6",
     "husky": "^9.1.7",
     "jsdom": "^27.4.0",
     "lint-staged": "^16.2.7",