feat: enhance profile editing with avatar support and UI adjustments

- Added AvatarPath to ProfileEditResult for user profile updates.
- Updated ProfileEditDialog to include avatar selection with a browse button.
- Increased dialog height to accommodate new avatar input fields.
- Implemented avatar file path handling in the profile edit dialog.

feat: introduce moderation features and user roles

- Added ServerRole enum to define user roles (Member, Mod, Admin, Owner).
- Extended User model to include role, mute, and ban status.
- Created ModerationController for user role assignment, kicking, banning, and muting.
- Implemented methods in IChatBroadcaster and SignalRBroadcaster for user moderation actions.
- Updated database schema with new columns for user roles and moderation states.

fix: ensure muted users cannot send messages

- Added mute status checks in ChatService to prevent message sending for muted users.
- Updated user presence and status handling to reflect role changes and moderation actions.

chore: update constants for ASCII art rendering

- Introduced AsciiArtHeightHalfBlock constant for improved ASCII art rendering.

src/EchoHub.Core/DTOs/ModerationDtos.cs

@@ -0,0 +1,8 @@
+using EchoHub.Core.Models;
+
+namespace EchoHub.Core.DTOs;
+
+public record AssignRoleRequest(string Username, ServerRole Role);
+public record MuteRequest(string? Reason = null, int? DurationMinutes = null);
+public record BanRequest(string? Reason = null);
+public record KickRequest(string? Reason = null);

src/EchoHub.Core/DTOs/ProfileDtos.cs

@@ -11,6 +11,7 @@ public record UserProfileDto(
     string? AvatarAscii,
     UserStatus Status,
     string? StatusMessage,
+    ServerRole Role,
     DateTimeOffset CreatedAt,
     DateTimeOffset LastSeenAt);
 
@@ -28,6 +29,7 @@ public record UserPresenceDto(
     string? DisplayName,
     string? NicknameColor,
     UserStatus Status,
-    string? StatusMessage);
+    string? StatusMessage,
+    ServerRole Role);
 
 public record AvatarUploadResponse(string AvatarAscii);