feat: Implement push notifications in Budget Manager PWA

- Added functionality for subscribing to push notifications in Settings.vue.
- Integrated service worker registration and notification permission requests.
- Enhanced Vite configuration for PWA with manifest and caching strategies.
- Created a script for generating PDF reports.
- Added project report markdown file detailing the PWA implementation and features.

backend/package.json

@@ -3,6 +3,11 @@
   "module": "index.ts",
   "type": "module",
   "private": true,
+  "scripts": {
+    "start": "bun run index.ts",
+    "dev": "bun --watch run index.ts",
+    "generate-vapid": "bun run scripts/generate-vapid-keys.js"
+  },
   "devDependencies": {
     "@types/bcrypt": "^5.0.2",
     "@types/bun": "latest",
@@ -23,6 +28,7 @@
     "koa-bodyparser": "^4.4.1",
     "koa-jwt": "^4.0.4",
     "koa-router": "^13.0.1",
-    "mongodb": "^6.16.0"
+    "mongodb": "^6.16.0",
+    "web-push": "^3.6.7"
   }
 }