Implement rate limiting and enhance authentication flow

- Added rate limiting configuration for authentication endpoints, allowing customizable request limits via environment variables.
- Updated authentication flow to utilize HttpRequest for cookie management, ensuring secure handling of refresh tokens.
- Introduced a new endpoint to retrieve user subscription details.
- Enhanced the handling of Telegram bot token validation to prevent errors with empty tokens.
- Updated the application to serialize enums as strings for better documentation and compatibility with TypeScript.
- Improved test coverage for new features and adjustments in command handlers.

backend/tests/PnvPanel.Application.Tests/Telegram/GetLoginRequestStatusQueryHandlerTests.cs

@@ -75,7 +75,7 @@ public class GetLoginRequestStatusQueryHandlerTests
         dbContext.TelegramLoginRequests.Add(request);
         await dbContext.SaveChangesAsync(CancellationToken.None);
 
-        var profile = new CurrentUserProfile(userId, "alice", Guid.NewGuid(), "user", true, false, 3);
+        var profile = new CurrentUserProfile(userId, "alice", Guid.NewGuid(), "user", true, false, 3, "sub-token");
         _identityService.GetProfileAsync(userId, Arg.Any<CancellationToken>()).Returns(profile);
         _jwtTokenService.GenerateAccessToken(Arg.Any<AuthenticatedUser>())
             .Returns(("access-token", DateTimeOffset.UtcNow.AddMinutes(15)));