refactor: restructure to monorepo architecture

- Move core agent engine to packages/core/
- Add packages/types/ for shared TypeScript types
- Add packages/utils/ for utility functions
- Add apps/cli/ for command-line interface
- Add apps/gateway/ for NestJS WebSocket gateway
- Add apps/server/ for REST API server
- Restructure desktop app (electron/ → src/main/, src/preload/)
- Update pnpm workspace configuration
- Remove legacy src/ directory

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/server/main.ts

@@ -0,0 +1,21 @@
+import "reflect-metadata";
+import { NestFactory } from "@nestjs/core";
+import { Logger } from "nestjs-pino";
+import { AppModule } from "./app.module.js";
+
+async function bootstrap(): Promise<void> {
+  const app = await NestFactory.create(AppModule, { bufferLogs: true });
+  app.enableCors();
+  app.useLogger(app.get(Logger));
+
+  const port = process.env["PORT"] ?? 4000;
+  await app.listen(port);
+
+  const logger = app.get(Logger);
+  logger.log(`Console is running on http://localhost:${port}`);
+}
+
+bootstrap().catch((err) => {
+  console.error("Failed to start console:", err);
+  process.exit(1);
+});