feat(wecom): 企微 API 插件增加 MCP Streamable HTTP 端点

与 REST/OpenAPI 并存，按实例权限自动 tools/list，免手填工具。

Co-authored-by: Cursor <cursoragent@cursor.com>

server/dukang-api/src/integrations/wecom/wecom-plugin-mcp.controller.ts

@@ -0,0 +1,27 @@
+import { Controller, Delete, Get, Post, Req, Res, UseGuards } from '@nestjs/common';
+import type { Request, Response } from 'express';
+import { CurrentWecomPlugin } from './wecom-plugin.decorators';
+import { WecomPluginGuard } from './wecom-plugin.guard';
+import { WecomPluginMcpFactory } from './wecom-plugin-mcp.factory';
+import type { WecomPluginRuntime } from './wecom-plugin.types';
+
+@Controller('wecom/plugin/mcp')
+@UseGuards(WecomPluginGuard)
+export class WecomPluginMcpController {
+  constructor(private readonly mcp: WecomPluginMcpFactory) {}
+
+  @Post()
+  post(@CurrentWecomPlugin() plugin: WecomPluginRuntime, @Req() req: Request, @Res() res: Response) {
+    return this.mcp.handle(req, res, plugin);
+  }
+
+  @Get()
+  get(@CurrentWecomPlugin() plugin: WecomPluginRuntime, @Req() req: Request, @Res() res: Response) {
+    return this.mcp.handle(req, res, plugin);
+  }
+
+  @Delete()
+  delete(@CurrentWecomPlugin() plugin: WecomPluginRuntime, @Req() req: Request, @Res() res: Response) {
+    return this.mcp.handle(req, res, plugin);
+  }
+}