feat: 增强 Chat 能力并补充单机部署方案

完善会话消息删除、Qwen 联网搜索/深度思考参数与 SSE 来源事件，同时增加请求体日志与 TS6 配置兼容调整，并新增 Ubuntu+PM2+Nginx 的部署文档与脚本以支持可回滚发布。

Made-with: Cursor

src/apps/client-app/chat/dto/stream-chat.dto.ts

@@ -1,6 +1,13 @@
 import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
 import { Type } from 'class-transformer';
-import { IsArray, IsIn, IsOptional, IsString, ValidateNested } from 'class-validator';
+import {
+  IsArray,
+  IsBoolean,
+  IsIn,
+  IsOptional,
+  IsString,
+  ValidateNested,
+} from 'class-validator';
 import { StreamChatRequest } from '@shared/ai-gateway/types/chat.types';
 
 export class ChatMessageDto {
@@ -43,6 +50,24 @@ export class StreamChatBodyDto implements StreamChatRequest {
   @IsString()
   platform?: string;
 
+  @ApiPropertyOptional({
+    type: Boolean,
+    description: '是否启用联网搜索（当前仅 qwen 平台生效）',
+    example: true,
+  })
+  @IsOptional()
+  @IsBoolean()
+  enableWebSearch?: boolean;
+
+  @ApiPropertyOptional({
+    type: Boolean,
+    description: '是否启用深度思考（当前仅 qwen 平台生效）',
+    example: true,
+  })
+  @IsOptional()
+  @IsBoolean()
+  enableThinking?: boolean;
+
   @ApiProperty({
     type: () => ChatMessageDto,
     isArray: true,