diff --git a/src/business/zulip/dto/chat.dto.ts b/src/business/zulip/dto/chat.dto.ts
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+/**
+ * 聊天相关的 DTO 定义
+ * 
+ * @author angjustinl
+ * @version 1.0.0
+ * @since 2025-01-07
+ */
+
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+import { IsString, IsNotEmpty, IsOptional, IsNumber, IsBoolean, IsEnum, IsArray, ValidateNested } from 'class-validator';
+import { Type } from 'class-transformer';
+
+/**
+ * 发送聊天消息请求 DTO
+ */
+export class SendChatMessageDto {
+  @ApiProperty({
+    description: '消息内容',
+    example: '大家好！我刚进入游戏',
+    maxLength: 1000
+  })
+  @IsString()
+  @IsNotEmpty()
+  content: string;
+
+  @ApiProperty({
+    description: '消息范围',
+    example: 'local',
+    enum: ['local', 'global'],
+    default: 'local'
+  })
+  @IsString()
+  @IsNotEmpty()
+  scope: string;
+
+  @ApiPropertyOptional({
+    description: '地图ID（可选，用于地图相关消息）',
+    example: 'whale_port'
+  })
+  @IsOptional()
+  @IsString()
+  mapId?: string;
+}
+
+/**
+ * 聊天消息响应 DTO
+ */
+export class ChatMessageResponseDto {
+  @ApiProperty({
+    description: '是否成功',
+    example: true
+  })
+  success: boolean;
+
+  @ApiProperty({
+    description: '消息ID',
+    example: 12345
+  })
+  messageId: number;
+
+  @ApiProperty({
+    description: '响应消息',
+    example: '消息发送成功'
+  })
+  message: string;
+
+  @ApiPropertyOptional({
+    description: '错误信息（失败时）',
+    example: '消息内容不能为空'
+  })
+  error?: string;
+}
+
+/**
+ * 获取聊天历史请求 DTO
+ */
+export class GetChatHistoryDto {
+  @ApiPropertyOptional({
+    description: '地图ID（可选）',
+    example: 'whale_port'
+  })
+  @IsOptional()
+  @IsString()
+  mapId?: string;
+
+  @ApiPropertyOptional({
+    description: '消息数量限制',
+    example: 50,
+    default: 50,
+    minimum: 1,
+    maximum: 100
+  })
+  @IsOptional()
+  @IsNumber()
+  @Type(() => Number)
+  limit?: number = 50;
+
+  @ApiPropertyOptional({
+    description: '偏移量（分页用）',
+    example: 0,
+    default: 0,
+    minimum: 0
+  })
+  @IsOptional()
+  @IsNumber()
+  @Type(() => Number)
+  offset?: number = 0;
+}
+
+/**
+ * 聊天消息信息 DTO
+ */
+export class ChatMessageInfoDto {
+  @ApiProperty({
+    description: '消息ID',
+    example: 12345
+  })
+  id: number;
+
+  @ApiProperty({
+    description: '发送者用户名',
+    example: 'Player_123'
+  })
+  sender: string;
+
+  @ApiProperty({
+    description: '消息内容',
+    example: '大家好！'
+  })
+  content: string;
+
+  @ApiProperty({
+    description: '消息范围',
+    example: 'local'
+  })
+  scope: string;
+
+  @ApiProperty({
+    description: '地图ID',
+    example: 'whale_port'
+  })
+  mapId: string;
+
+  @ApiProperty({
+    description: '发送时间',
+    example: '2025-01-07T14:30:00.000Z'
+  })
+  timestamp: string;
+
+  @ApiProperty({
+    description: 'Zulip Stream 名称',
+    example: 'Whale Port'
+  })
+  streamName: string;
+
+  @ApiProperty({
+    description: 'Zulip Topic 名称',
+    example: 'Game Chat'
+  })
+  topicName: string;
+}
+
+/**
+ * 聊天历史响应 DTO
+ */
+export class ChatHistoryResponseDto {
+  @ApiProperty({
+    description: '是否成功',
+    example: true
+  })
+  success: boolean;
+
+  @ApiProperty({
+    description: '消息列表',
+    type: [ChatMessageInfoDto]
+  })
+  @ValidateNested({ each: true })
+  @Type(() => ChatMessageInfoDto)
+  messages: ChatMessageInfoDto[];
+
+  @ApiProperty({
+    description: '总消息数',
+    example: 150
+  })
+  total: number;
+
+  @ApiProperty({
+    description: '当前页消息数',
+    example: 50
+  })
+  count: number;
+
+  @ApiPropertyOptional({
+    description: '错误信息（失败时）',
+    example: '获取消息历史失败'
+  })
+  error?: string;
+}
+
+/**
+ * WebSocket 连接状态 DTO
+ */
+export class WebSocketStatusDto {
+  @ApiProperty({
+    description: '总连接数',
+    example: 25
+  })
+  totalConnections: number;
+
+  @ApiProperty({
+    description: '已认证连接数',
+    example: 20
+  })
+  authenticatedConnections: number;
+
+  @ApiProperty({
+    description: '活跃会话数',
+    example: 18
+  })
+  activeSessions: number;
+
+  @ApiProperty({
+    description: '各地图在线人数',
+    example: {
+      'whale_port': 8,
+      'pumpkin_valley': 5,
+      'novice_village': 7
+    }
+  })
+  mapPlayerCounts: Record<string, number>;
+}
+
+/**
+ * Zulip 集成状态 DTO
+ */
+export class ZulipIntegrationStatusDto {
+  @ApiProperty({
+    description: 'Zulip 服务器连接状态',
+    example: true
+  })
+  serverConnected: boolean;
+
+  @ApiProperty({
+    description: 'Zulip 服务器版本',
+    example: '11.4'
+  })
+  serverVersion: string;
+
+  @ApiProperty({
+    description: '机器人账号状态',
+    example: true
+  })
+  botAccountActive: boolean;
+
+  @ApiProperty({
+    description: '可用 Stream 数量',
+    example: 12
+  })
+  availableStreams: number;
+
+  @ApiProperty({
+    description: '游戏相关 Stream 列表',
+    example: ['Whale Port', 'Pumpkin Valley', 'Novice Village']
+  })
+  gameStreams: string[];
+
+  @ApiProperty({
+    description: '最近24小时消息数',
+    example: 156
+  })
+  recentMessageCount: number;
+}
+
+/**
+ * 系统状态响应 DTO
+ */
+export class SystemStatusResponseDto {
+  @ApiProperty({
+    description: 'WebSocket 状态',
+    type: WebSocketStatusDto
+  })
+  @ValidateNested()
+  @Type(() => WebSocketStatusDto)
+  websocket: WebSocketStatusDto;
+
+  @ApiProperty({
+    description: 'Zulip 集成状态',
+    type: ZulipIntegrationStatusDto
+  })
+  @ValidateNested()
+  @Type(() => ZulipIntegrationStatusDto)
+  zulip: ZulipIntegrationStatusDto;
+
+  @ApiProperty({
+    description: '系统运行时间（秒）',
+    example: 86400
+  })
+  uptime: number;
+
+  @ApiProperty({
+    description: '内存使用情况',
+    example: {
+      used: '45.2 MB',
+      total: '64.0 MB',
+      percentage: 70.6
+    }
+  })
+  memory: {
+    used: string;
+    total: string;
+    percentage: number;
+  };
+}
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