fix(#411): resolve CI lint crash from ajv override

Drop the global ajv override that forced ESLint onto an incompatible major, then move @mosaic/config lint tooling deps to devDependencies so production audit stays clean without impacting runtime deps.

packages/config/package.json

@@ -13,7 +13,7 @@
     "./eslint/nestjs": "./eslint/nestjs.js",
     "./prettier": "./prettier/index.js"
   },
-  "dependencies": {
+  "devDependencies": {
     "@eslint/js": "^9.21.0",
     "@typescript-eslint/eslint-plugin": "^8.26.0",
     "@typescript-eslint/parser": "^8.26.0",
@@ -22,9 +22,7 @@
     "eslint-plugin-prettier": "^5.2.3",
     "eslint-plugin-security": "^3.0.1",
     "prettier": "^3.5.3",
+    "typescript": "^5.8.2",
     "typescript-eslint": "^8.26.0"
-  },
-  "devDependencies": {
-    "typescript": "^5.8.2"
   }
 }