feat(server): add auth, user, and studio modules

Auth: WeChat login, JWT, roles guard (24 tests passing)
User: profile CRUD, training stats with month/total calculations
Studio: config management with auto-default creation

packages/server/src/studio/studio.controller.ts

@@ -0,0 +1,30 @@
+import {
+  Body,
+  Controller,
+  Get,
+  Put,
+  UseGuards,
+} from '@nestjs/common'
+import { UserRole } from '@mp-pilates/shared'
+import { JwtAuthGuard } from '../auth/jwt-auth.guard'
+import { Roles } from '../auth/roles.decorator'
+import { RolesGuard } from '../auth/roles.guard'
+import { UpdateStudioDto } from './dto/update-studio.dto'
+import { StudioService } from './studio.service'
+
+@Controller()
+export class StudioController {
+  constructor(private readonly studioService: StudioService) {}
+
+  @Get('studio/info')
+  getInfo() {
+    return this.studioService.getInfo()
+  }
+
+  @Put('admin/studio/info')
+  @UseGuards(JwtAuthGuard, RolesGuard)
+  @Roles(UserRole.ADMIN)
+  updateInfo(@Body() dto: UpdateStudioDto) {
+    return this.studioService.updateInfo(dto)
+  }
+}