📦 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/css-select/lib/compile.d.ts

@@ -0,0 +1,14 @@
+import { InternalSelector } from "./types";
+import { Selector } from "css-what";
+import type { CompiledQuery, InternalOptions } from "./types";
+/**
+ * Compiles a selector to an executable function.
+ *
+ * @param selector Selector to compile.
+ * @param options Compilation options.
+ * @param context Optional context for the selector.
+ */
+export declare function compile<Node, ElementNode extends Node>(selector: string | Selector[][], options: InternalOptions<Node, ElementNode>, context?: Node[] | Node): CompiledQuery<Node>;
+export declare function compileUnsafe<Node, ElementNode extends Node>(selector: string | Selector[][], options: InternalOptions<Node, ElementNode>, context?: Node[] | Node): CompiledQuery<ElementNode>;
+export declare function compileToken<Node, ElementNode extends Node>(token: InternalSelector[][], options: InternalOptions<Node, ElementNode>, context?: Node[] | Node): CompiledQuery<ElementNode>;
+//# sourceMappingURL=compile.d.ts.map