feat: Add backend support for one-click Rust server deployment

Add deploy endpoint, DTO, NATS command publisher, and WebSocket bridge
subscription to support the one-click server deployment feature via the
companion agent.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend-nest/src/modules/servers/servers.controller.ts

@@ -3,6 +3,7 @@ import { ApiTags, ApiBearerAuth, ApiOperation } from '@nestjs/swagger';
 import { ServersService } from './servers.service';
 import { UpdateServerConfigDto } from './dto/update-config.dto';
 import { SendCommandDto } from './dto/send-command.dto';
+import { DeployServerDto } from './dto/deploy-server.dto';
 import { CurrentTenant } from '../../common/decorators/current-tenant.decorator';
 import { RequirePermission } from '../../common/decorators/require-permission.decorator';
 import { JwtAuthGuard } from '../../common/guards/jwt-auth.guard';
@@ -62,4 +63,14 @@ export class ServersController {
   async restartServer(@CurrentTenant() licenseId: string) {
     return await this.serversService.restartServer(licenseId);
   }
+
+  @Post('deploy')
+  @RequirePermission('server.manage')
+  @ApiOperation({ summary: 'Deploy Rust server via companion agent' })
+  async deployServer(
+    @CurrentTenant() licenseId: string,
+    @Body() dto: DeployServerDto,
+  ) {
+    return await this.serversService.deployServer(licenseId, dto);
+  }
 }