📦 添加虚拟环境和启动脚本

新增:
- backend/venv/ - Python 虚拟环境
- backend/start.sh - 启动脚本（使用虚拟环境）
- backend/requirements.txt - 依赖列表
- .gitignore - 忽略虚拟环境和缓存文件

说明:
- 每个项目使用独立虚拟环境
- 避免依赖冲突
- 启动脚本自动创建和激活虚拟环境

frontend/node_modules/events/tests/special-event-names.js

@@ -0,0 +1,45 @@
+'use strict';
+
+var common = require('./common');
+var EventEmitter = require('../');
+var assert = require('assert');
+
+var ee = new EventEmitter();
+var handler = function() {};
+
+assert.strictEqual(ee.eventNames().length, 0);
+
+assert.strictEqual(ee._events.hasOwnProperty, undefined);
+assert.strictEqual(ee._events.toString, undefined);
+
+ee.on('__defineGetter__', handler);
+ee.on('toString', handler);
+ee.on('__proto__', handler);
+
+assert.strictEqual(ee.eventNames()[0], '__defineGetter__');
+assert.strictEqual(ee.eventNames()[1], 'toString');
+
+assert.strictEqual(ee.listeners('__defineGetter__').length, 1);
+assert.strictEqual(ee.listeners('__defineGetter__')[0], handler);
+assert.strictEqual(ee.listeners('toString').length, 1);
+assert.strictEqual(ee.listeners('toString')[0], handler);
+
+// Only run __proto__ tests if that property can actually be set
+if ({ __proto__: 'ok' }.__proto__ === 'ok') {
+  assert.strictEqual(ee.eventNames().length, 3);
+  assert.strictEqual(ee.eventNames()[2], '__proto__');
+  assert.strictEqual(ee.listeners('__proto__').length, 1);
+  assert.strictEqual(ee.listeners('__proto__')[0], handler);
+
+  ee.on('__proto__', common.mustCall(function(val) {
+    assert.strictEqual(val, 1);
+  }));
+  ee.emit('__proto__', 1);
+
+  process.on('__proto__', common.mustCall(function(val) {
+    assert.strictEqual(val, 1);
+  }));
+  process.emit('__proto__', 1);
+} else {
+  console.log('# skipped __proto__')
+}