feat: AI Town MVP - 完整三层架构实现

- Python FastAPI 引擎：世界状态模拟、全局能量条、世界事件系统
- Node.js WebSocket 服务器：实时通信、事件队列批处理
- 前端仪表盘：世界状态可视化、行动日志、事件展示

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

server-node/src/engine.ts

@@ -0,0 +1,17 @@
+import { StepRequest, StepResponse } from './types';
+
+const ENGINE_URL = 'http://localhost:8000/step';
+
+export async function callEngine(request: StepRequest): Promise<StepResponse> {
+  const response = await fetch(ENGINE_URL, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(request),
+  });
+
+  if (!response.ok) {
+    throw new Error(`Engine returned ${response.status}`);
+  }
+
+  return response.json() as Promise<StepResponse>;
+}