Add authentication support with login/logout UI

- Introduced AuthService, IAuthApiClient, and AuthApiClient for managing authentication state and API calls (login, logout, session restore).
- Added Login.razor and LoginLayout.razor for the login page, including styling and logic.
- MainLayout.razor now checks authentication on load, restores sessions from sessionStorage, and redirects to /login if unauthenticated. Displays username and logout button when logged in.
- Implemented JS interop (authStorage) for persisting authentication info in sessionStorage.
- Registered AuthService, CookieContainer, and API clients in Program.cs to share cookies and support authentication.
- Updated AppSettings and appsettings files to support separate ApiBaseUrl and DataApiBaseUrl.
- Minor CSS improvements for username display in the top bar.

DbFirst.BlazorWebApp/appsettings.Development.json

@@ -5,7 +5,8 @@
       "Microsoft.AspNetCore": "Warning"
     }
   },
-  "ApiBaseUrl": "https://localhost:7204/",
+  "ApiBaseUrl": "http://172.24.12.39:9090/",
+  "DataApiBaseUrl": "https://localhost:7204/",
   "BrowserLink": {
     "Enabled": false
   },