📦 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/lodash/_arrayIncludes.js

@@ -0,0 +1,17 @@
+var baseIndexOf = require('./_baseIndexOf');
+
+/**
+ * A specialized version of `_.includes` for arrays without support for
+ * specifying an index to search from.
+ *
+ * @private
+ * @param {Array} [array] The array to inspect.
+ * @param {*} target The value to search for.
+ * @returns {boolean} Returns `true` if `target` is found, else `false`.
+ */
+function arrayIncludes(array, value) {
+  var length = array == null ? 0 : array.length;
+  return !!length && baseIndexOf(array, value, 0) > -1;
+}
+
+module.exports = arrayIncludes;