📦 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-syntax-flow/LICENSE

@@ -0,0 +1,22 @@
+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-syntax-flow/README.md

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+# @babel/plugin-syntax-flow
+
+> Allow parsing of the flow syntax
+
+See our website [@babel/plugin-syntax-flow](https://babeljs.io/docs/babel-plugin-syntax-flow) for more information.
+
+## Install
+
+Using npm:
+
+```sh
+npm install --save-dev @babel/plugin-syntax-flow
+```
+
+or using yarn:
+
+```sh
+yarn add @babel/plugin-syntax-flow --dev
+```

frontend/node_modules/@babel/plugin-syntax-flow/lib/index.js

@@ -0,0 +1,34 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+var _helperPluginUtils = require("@babel/helper-plugin-utils");
+var _default = exports.default = (0, _helperPluginUtils.declare)((api, options) => {
+  api.assertVersion("^7.0.0-0 || ^8.0.0-0");
+  const {
+    all,
+    enums
+  } = options;
+  if (typeof all !== "boolean" && all !== undefined) {
+    throw new Error(".all must be a boolean, or undefined");
+  }
+  if (enums === false) {
+    console.warn("The .enums option has been removed and it's now always enabled.");
+  }
+  return {
+    name: "syntax-flow",
+    manipulateOptions(opts, parserOpts) {
+      if (parserOpts.plugins.some(p => (Array.isArray(p) ? p[0] : p) === "typescript")) {
+        return;
+      }
+      parserOpts.plugins.push(["flow", {
+        all,
+        enums
+      }]);
+    }
+  };
+});
+
+//# sourceMappingURL=index.js.map

frontend/node_modules/@babel/plugin-syntax-flow/lib/index.js.map

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+{"version":3,"names":["_helperPluginUtils","require","_default","exports","default","declare","api","options","assertVersion","all","enums","undefined","Error","console","warn","name","manipulateOptions","opts","parserOpts","plugins","some","p","Array","isArray","push"],"sources":["../src/index.ts"],"sourcesContent":["import { declare } from \"@babel/helper-plugin-utils\";\n\nexport interface Options {\n  all?: boolean;\n}\n\nexport default declare((api, options: Options) => {\n  api.assertVersion(REQUIRED_VERSION(\"^7.0.0-0 || ^8.0.0-0\"));\n\n  // When enabled and plugins includes flow, all files should be parsed as if\n  // the @flow pragma was provided.\n  // @ts-expect-error Babel 7\n  const { all, enums } = options;\n\n  if (typeof all !== \"boolean\" && all !== undefined) {\n    throw new Error(\".all must be a boolean, or undefined\");\n  }\n\n  if (process.env.BABEL_8_BREAKING) {\n    if (enums !== undefined) {\n      throw new Error(\n        \"The .enums option has been removed and it's now always enabled. Please remove it from your config.\",\n      );\n    }\n  } else {\n    if (enums === false) {\n      console.warn(\n        \"The .enums option has been removed and it's now always enabled.\",\n      );\n    }\n  }\n\n  return {\n    name: \"syntax-flow\",\n\n    manipulateOptions(opts, parserOpts) {\n      if (!process.env.BABEL_8_BREAKING) {\n        // If the file has already enabled TS, assume that this is not a\n        // valid Flowtype file.\n        if (\n          parserOpts.plugins.some(\n            p => (Array.isArray(p) ? p[0] : p) === \"typescript\",\n          )\n        ) {\n          return;\n        }\n      }\n\n      if (process.env.BABEL_8_BREAKING) {\n        parserOpts.plugins.push([\"flow\", { all }]);\n      } else {\n        // @ts-expect-error Babel 7\n        parserOpts.plugins.push([\"flow\", { all, enums }]);\n      }\n    },\n  };\n});\n"],"mappings":";;;;;;AAAA,IAAAA,kBAAA,GAAAC,OAAA;AAAqD,IAAAC,QAAA,GAAAC,OAAA,CAAAC,OAAA,GAMtC,IAAAC,0BAAO,EAAC,CAACC,GAAG,EAAEC,OAAgB,KAAK;EAChDD,GAAG,CAACE,aAAa,CAAkB,sBAAuB,CAAC;EAK3D,MAAM;IAAEC,GAAG;IAAEC;EAAM,CAAC,GAAGH,OAAO;EAE9B,IAAI,OAAOE,GAAG,KAAK,SAAS,IAAIA,GAAG,KAAKE,SAAS,EAAE;IACjD,MAAM,IAAIC,KAAK,CAAC,sCAAsC,CAAC;EACzD;EASE,IAAIF,KAAK,KAAK,KAAK,EAAE;IACnBG,OAAO,CAACC,IAAI,CACV,iEACF,CAAC;EACH;EAGF,OAAO;IACLC,IAAI,EAAE,aAAa;IAEnBC,iBAAiBA,CAACC,IAAI,EAAEC,UAAU,EAAE;MAIhC,IACEA,UAAU,CAACC,OAAO,CAACC,IAAI,CACrBC,CAAC,IAAI,CAACC,KAAK,CAACC,OAAO,CAACF,CAAC,CAAC,GAAGA,CAAC,CAAC,CAAC,CAAC,GAAGA,CAAC,MAAM,YACzC,CAAC,EACD;QACA;MACF;MAOAH,UAAU,CAACC,OAAO,CAACK,IAAI,CAAC,CAAC,MAAM,EAAE;QAAEf,GAAG;QAAEC;MAAM,CAAC,CAAC,CAAC;IAErD;EACF,CAAC;AACH,CAAC,CAAC","ignoreList":[]}

frontend/node_modules/@babel/plugin-syntax-flow/package.json

@@ -0,0 +1,33 @@
+{
+  "name": "@babel/plugin-syntax-flow",
+  "version": "7.28.6",
+  "description": "Allow parsing of the flow syntax",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/babel/babel.git",
+    "directory": "packages/babel-plugin-syntax-flow"
+  },
+  "homepage": "https://babel.dev/docs/en/next/babel-plugin-syntax-flow",
+  "license": "MIT",
+  "publishConfig": {
+    "access": "public"
+  },
+  "main": "./lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ],
+  "dependencies": {
+    "@babel/helper-plugin-utils": "^7.28.6"
+  },
+  "peerDependencies": {
+    "@babel/core": "^7.0.0-0"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.28.6"
+  },
+  "engines": {
+    "node": ">=6.9.0"
+  },
+  "author": "The Babel Team (https://babel.dev/team)",
+  "type": "commonjs"
+}