📦 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/source-list-map/README.md

@@ -0,0 +1,91 @@
+# source-list-map
+
+## API
+
+### Example
+
+``` js
+var SourceListMap = require("source-list-map").SourceListMap;
+
+// Create a new map
+var map = new SourceListMap();
+
+// Add generated code that is map line to line to some soure
+map.add("Generated\ncode1\n", "source-code.js", "Orginal\nsource");
+
+// Add generated code that isn't mapped
+map.add("Generated\ncode2\n");
+
+// Get SourceMap and generated source
+map.toStringWithSourceMap({ file: "generated-code.js" });
+// {
+//   source: 'Generated\ncode1\nGenerated\ncode2\n',
+//   map: {
+//      version: 3,
+//      file: 'generated-code.js',
+//      sources: [ 'source-code.js' ],
+//      sourcesContent: [ 'Orginal\nsource' ],
+//      mappings: 'AAAA;AACA;;;'
+//    }
+// }
+
+// Convert existing SourceMap into SourceListMap
+// (Only the first mapping per line is preserved)
+var fromStringWithSourceMap = require("source-list-map").fromStringWithSourceMap;
+var map = fromStringWithSourceMap("Generated\ncode", { version: 3, ... });
+
+```
+
+### `new SourceListMap()`
+
+### `SourceListMap.prototype.add`
+
+``` js
+SourceListMap.prototype.add(generatedCode: string)
+SourceListMap.prototype.add(generatedCode: string, source: string, originalSource: string)
+SourceListMap.prototype.add(sourceListMap: SourceListMap)
+```
+
+Append some stuff.
+
+### `SourceListMap.prototype.prepend`
+
+``` js
+SourceListMap.prototype.prepend(generatedCode: string)
+SourceListMap.prototype.prepend(generatedCode: string, source: string, originalSource: string)
+SourceListMap.prototype.prepend(sourceListMap: SourceListMap)
+```
+
+Prepend some stuff.
+
+### `SourceListMap.prototype.toString()`
+
+Get generated code.
+
+### `SourceListMap.prototype.toStringWithSourceMap`
+
+``` js
+SourceListMap.prototype.toStringWithSourceMap(options: object)
+```
+
+Get generated code and SourceMap. `options` can contains `file` property which defines the `file` property of the SourceMap.
+
+### `SourceListMap.prototype.mapGeneratedCode`
+
+``` js
+SourceListMap.prototype.mapGeneratedCode(fn: function) : SourceListMap
+```
+
+Applies `fn` to each generated code block (per line). The returned value is set as new generated code. Returns a new SourceListMap.
+
+Removing and adding lines is supported. The SourceMap complexity will increase when doing this.
+
+## Test
+
+[![Build Status](https://travis-ci.org/webpack/source-list-map.svg)](https://travis-ci.org/webpack/source-list-map)
+
+## License
+
+Copyright (c) 2017 JS Foundation
+
+MIT (http://www.opensource.org/licenses/mit-license.php)