feat: implement user authentication with login functionality

- Add auth-api for handling login requests.
- Update index.ts to export AuthApi.
- Modify HeroLayout to display username or login link based on authentication state.
- Create LoginPage component for user login.
- Update router to include login route with EmptyLayout.
- Configure WebClient to include credentials in requests.
- Add auth-slice for managing authentication state in Redux.
- Update Redux store to include auth reducer.
- Define LoginRequest and User types in types/index.ts.
- Configure Vite to proxy API requests to the backend server.

src/api/index.ts

@@ -1,3 +1,4 @@
 export * as FirearmApi from "./firearm-api"
 export * as ModificationApi from "./modification-api"
 export * as TagApi from "./tag-api"
+export * as AuthApi from "./auth-api"