feat(auth): implement better authentication system with user sessions and password management

- Added user, session, account, and verification models to Prisma schema.
- Integrated better-auth for user authentication with email and password.
- Created auth middleware for session validation.
- Implemented auth context and client in frontend for managing user sessions.
- Added login and settings pages for user authentication and password management.
- Updated routes to include authentication checks and user-specific content.
- Enhanced UI components to reflect authentication state.

apps/backend/package.json

@@ -11,6 +11,7 @@
     "prisma:migrate:deploy": "prisma migrate deploy"
   },
   "dependencies": {
+    "@noble/ciphers": "^2.1.1",
     "@personal-admin/common": "workspace:*",
     "@prisma/adapter-pg": "^7.8.0",
     "@prisma/client": "^7.8.0",