📦 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/@babel/plugin-transform-dynamic-import/LICENSE

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+MIT License
+
+Copyright (c) 2014-present Sebastian McKenzie and other contributors
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

frontend/node_modules/@babel/plugin-transform-dynamic-import/README.md

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+# @babel/plugin-transform-dynamic-import
+
+> Transform import() expressions
+
+See our website [@babel/plugin-transform-dynamic-import](https://babeljs.io/docs/babel-plugin-transform-dynamic-import) for more information.
+
+## Install
+
+Using npm:
+
+```sh
+npm install --save-dev @babel/plugin-transform-dynamic-import
+```
+
+or using yarn:
+
+```sh
+yarn add @babel/plugin-transform-dynamic-import --dev
+```

frontend/node_modules/@babel/plugin-transform-dynamic-import/lib/index.js

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+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+var _helperPluginUtils = require("@babel/helper-plugin-utils");
+const SUPPORTED_MODULES = new Set(["commonjs", "amd", "systemjs"]);
+const MODULES_NOT_FOUND = `\
+@babel/plugin-transform-dynamic-import depends on a modules
+transform plugin. Supported plugins are:
+ - @babel/plugin-transform-modules-commonjs ^7.4.0
+ - @babel/plugin-transform-modules-amd ^7.4.0
+ - @babel/plugin-transform-modules-systemjs ^7.4.0
+
+If you are using Webpack or Rollup and thus don't want
+Babel to transpile your imports and exports, you can use
+the @babel/plugin-syntax-dynamic-import plugin and let your
+bundler handle dynamic imports.
+`;
+var _default = exports.default = (0, _helperPluginUtils.declare)(api => {
+  api.assertVersion(7);
+  return {
+    name: "transform-dynamic-import",
+    manipulateOptions: (_, parser) => parser.plugins.push("dynamicImport"),
+    pre() {
+      this.file.set("@babel/plugin-proposal-dynamic-import", "7.27.1");
+    },
+    visitor: {
+      Program() {
+        const modules = this.file.get("@babel/plugin-transform-modules-*");
+        if (!SUPPORTED_MODULES.has(modules)) {
+          throw new Error(MODULES_NOT_FOUND);
+        }
+      }
+    }
+  };
+});
+
+//# sourceMappingURL=index.js.map

frontend/node_modules/@babel/plugin-transform-dynamic-import/lib/index.js.map

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frontend/node_modules/@babel/plugin-transform-dynamic-import/package.json

@@ -0,0 +1,33 @@
+{
+  "name": "@babel/plugin-transform-dynamic-import",
+  "version": "7.27.1",
+  "description": "Transform import() expressions",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/babel/babel.git",
+    "directory": "packages/babel-plugin-transform-dynamic-import"
+  },
+  "license": "MIT",
+  "publishConfig": {
+    "access": "public"
+  },
+  "main": "./lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ],
+  "dependencies": {
+    "@babel/helper-plugin-utils": "^7.27.1"
+  },
+  "peerDependencies": {
+    "@babel/core": "^7.0.0-0"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.27.1",
+    "@babel/helper-plugin-test-runner": "^7.27.1"
+  },
+  "engines": {
+    "node": ">=6.9.0"
+  },
+  "author": "The Babel Team (https://babel.dev/team)",
+  "type": "commonjs"
+}