Refactor classes to use constructor injection for dependencies

- Updated IrcBroadcaster to use constructor injection for IrcGatewayService.
- Refactored JwtTokenService to initialize configuration values in the constructor.
- Modified AuthController to use constructor injection for EchoHubDbContext and JwtTokenService.
- Refactored ChannelsController to utilize constructor injection for dependencies.
- Updated FilesController to use constructor injection for FileStorageService.
- Refactored ServerController to initialize EchoHubDbContext and IConfiguration via constructor.
- Modified UsersController to use constructor injection for EchoHubDbContext and ImageToAsciiService.
- Updated EchoHubDbContext to use constructor for DbContextOptions.
- Refactored ChatHub to use constructor injection for IChatService and ILogger.
- Modified ChatService to utilize constructor injection for dependencies.
- Refactored ServerDirectoryService to use constructor injection for IConfiguration, PresenceTracker, and ILogger.

src/EchoHub.Server/Auth/JwtTokenService.cs

@@ -7,18 +7,25 @@ using Microsoft.IdentityModel.Tokens;
 
 namespace EchoHub.Server.Auth;
 
-public class JwtTokenService(IConfiguration configuration)
+public class JwtTokenService
 {
-    private readonly string _secret = configuration["Jwt:Secret"]
-        ?? throw new InvalidOperationException("Jwt:Secret is not configured.");
-    private readonly string _issuer = configuration["Jwt:Issuer"]
-        ?? throw new InvalidOperationException("Jwt:Issuer is not configured.");
-    private readonly string _audience = configuration["Jwt:Audience"]
-        ?? throw new InvalidOperationException("Jwt:Audience is not configured.");
+    private readonly string _secret;
+    private readonly string _issuer;
+    private readonly string _audience;
 
     private static readonly TimeSpan AccessTokenLifetime = TimeSpan.FromMinutes(15);
     public static readonly TimeSpan RefreshTokenLifetime = TimeSpan.FromDays(30);
 
+    public JwtTokenService(IConfiguration configuration)
+    {
+        _secret = configuration["Jwt:Secret"]
+            ?? throw new InvalidOperationException("Jwt:Secret is not configured.");
+        _issuer = configuration["Jwt:Issuer"]
+            ?? throw new InvalidOperationException("Jwt:Issuer is not configured.");
+        _audience = configuration["Jwt:Audience"]
+            ?? throw new InvalidOperationException("Jwt:Audience is not configured.");
+    }
+
     public (string Token, DateTimeOffset ExpiresAt) GenerateAccessToken(User user)
     {
         var key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_secret));