Add ESLint integration and Angular linting support

Configured ESLint for the project with Angular and TypeScript support. Added angular-eslint dependencies, updated angular.json to include linting, and created eslint.config.js for lint rules. Updated package.json and package-lock.json with new dev dependencies.

package.json

@@ -6,7 +6,8 @@
     "start": "ng serve",
     "build": "ng build",
     "watch": "ng build --watch --configuration development",
-    "test": "ng test"
+    "test": "ng test",
+    "lint": "ng lint"
   },
   "private": true,
   "dependencies": {
@@ -35,7 +36,10 @@
     "@angular/compiler-cli": "~21.1.0",
     "@angular/platform-browser-dynamic": "~21.1.0",
     "@types/jasmine": "~5.1.15",
+    "angular-eslint": "21.2.0",
+    "eslint": "^9.39.2",
     "jasmine-core": "~6.0.1",
-    "typescript": "~5.9.3"
+    "typescript": "~5.9.3",
+    "typescript-eslint": "8.50.1"
   }
-}
+}