feat: Implement support chat functionality, add 2FA verification screen and routing, and update dependencies.

lib/features/support_chat/data/models/support_chat_models.dart

@@ -0,0 +1,93 @@
+class SupportChat {
+  final String id;
+  final String userId;
+  final String status; // OPEN, CLOSED
+  final String? lastMessageAt;
+  final String? lastMessageText;
+  final int userUnreadCount;
+  final int adminUnreadCount;
+  final String createdAt;
+  final String updatedAt;
+
+  const SupportChat({
+    required this.id,
+    required this.userId,
+    required this.status,
+    this.lastMessageAt,
+    this.lastMessageText,
+    required this.userUnreadCount,
+    required this.adminUnreadCount,
+    required this.createdAt,
+    required this.updatedAt,
+  });
+
+  factory SupportChat.fromJson(Map<String, dynamic> json) {
+    return SupportChat(
+      id: json['id'] as String,
+      userId: json['userId'] as String,
+      status: json['status'] as String? ?? 'OPEN',
+      lastMessageAt: json['lastMessageAt'] as String?,
+      lastMessageText: json['lastMessageText'] as String?,
+      userUnreadCount: json['userUnreadCount'] as int? ?? 0,
+      adminUnreadCount: json['adminUnreadCount'] as int? ?? 0,
+      createdAt: json['createdAt'] as String,
+      updatedAt: json['updatedAt'] as String,
+    );
+  }
+
+  bool get isClosed => status == 'CLOSED';
+}
+
+class SupportMessage {
+  final String id;
+  final String chatId;
+  final String senderId;
+  final String senderRole;
+  final String content;
+  final String createdAt;
+
+  const SupportMessage({
+    required this.id,
+    required this.chatId,
+    required this.senderId,
+    required this.senderRole,
+    required this.content,
+    required this.createdAt,
+  });
+
+  factory SupportMessage.fromJson(Map<String, dynamic> json) {
+    return SupportMessage(
+      id: json['id'] as String,
+      chatId: json['chatId'] as String,
+      senderId: json['senderId'] as String,
+      senderRole: json['senderRole'] as String? ?? 'USER',
+      content: json['content'] as String,
+      createdAt: json['createdAt'] as String,
+    );
+  }
+}
+
+class SupportPagination {
+  final int page;
+  final int limit;
+  final int total;
+  final int pages;
+
+  const SupportPagination({
+    required this.page,
+    required this.limit,
+    required this.total,
+    required this.pages,
+  });
+
+  factory SupportPagination.fromJson(Map<String, dynamic> json) {
+    return SupportPagination(
+      page: json['page'] as int? ?? 1,
+      limit: json['limit'] as int? ?? 50,
+      total: json['total'] as int? ?? 0,
+      pages: json['pages'] as int? ?? 1,
+    );
+  }
+
+  bool get hasMore => page < pages;
+}