📦 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-proposal-optional-chaining/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-proposal-optional-chaining/README.md

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+# @babel/plugin-proposal-optional-chaining
+
+> Transform optional chaining operators into a series of nil checks
+
+See our website [@babel/plugin-proposal-optional-chaining](https://babeljs.io/docs/en/babel-plugin-proposal-optional-chaining) for more information.
+
+## Install
+
+Using npm:
+
+```sh
+npm install --save-dev @babel/plugin-proposal-optional-chaining
+```
+
+or using yarn:
+
+```sh
+yarn add @babel/plugin-proposal-optional-chaining --dev
+```

frontend/node_modules/@babel/plugin-proposal-optional-chaining/lib/index.js

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+'use strict';
+
+Object.defineProperty(exports, '__esModule', { value: true });
+
+var helperPluginUtils = require('@babel/helper-plugin-utils');
+var syntaxOptionalChaining = require('@babel/plugin-syntax-optional-chaining');
+var core = require('@babel/core');
+var helperSkipTransparentExpressionWrappers = require('@babel/helper-skip-transparent-expression-wrappers');
+
+function willPathCastToBoolean(path) {
+  const maybeWrapped = findOutermostTransparentParent(path);
+  const {
+    node,
+    parentPath
+  } = maybeWrapped;
+  if (parentPath.isLogicalExpression()) {
+    const {
+      operator,
+      right
+    } = parentPath.node;
+    if (operator === "&&" || operator === "||" || operator === "??" && node === right) {
+      return willPathCastToBoolean(parentPath);
+    }
+  }
+  if (parentPath.isSequenceExpression()) {
+    const {
+      expressions
+    } = parentPath.node;
+    if (expressions[expressions.length - 1] === node) {
+      return willPathCastToBoolean(parentPath);
+    } else {
+      return true;
+    }
+  }
+  return parentPath.isConditional({
+    test: node
+  }) || parentPath.isUnaryExpression({
+    operator: "!"
+  }) || parentPath.isLoop({
+    test: node
+  });
+}
+function findOutermostTransparentParent(path) {
+  let maybeWrapped = path;
+  path.findParent(p => {
+    if (!helperSkipTransparentExpressionWrappers.isTransparentExprWrapper(p.node)) return true;
+    maybeWrapped = p;
+  });
+  return maybeWrapped;
+}
+
+const {
+  ast
+} = core.template.expression;
+function isSimpleMemberExpression(expression) {
+  expression = helperSkipTransparentExpressionWrappers.skipTransparentExprWrapperNodes(expression);
+  return core.types.isIdentifier(expression) || core.types.isSuper(expression) || core.types.isMemberExpression(expression) && !expression.computed && isSimpleMemberExpression(expression.object);
+}
+function needsMemoize(path) {
+  let optionalPath = path;
+  const {
+    scope
+  } = path;
+  while (optionalPath.isOptionalMemberExpression() || optionalPath.isOptionalCallExpression()) {
+    const {
+      node
+    } = optionalPath;
+    const childPath = helperSkipTransparentExpressionWrappers.skipTransparentExprWrappers(optionalPath.isOptionalMemberExpression() ? optionalPath.get("object") : optionalPath.get("callee"));
+    if (node.optional) {
+      return !scope.isStatic(childPath.node);
+    }
+    optionalPath = childPath;
+  }
+}
+function transform(path, {
+  pureGetters,
+  noDocumentAll
+}) {
+  const {
+    scope
+  } = path;
+  const maybeWrapped = findOutermostTransparentParent(path);
+  const {
+    parentPath
+  } = maybeWrapped;
+  const willReplacementCastToBoolean = willPathCastToBoolean(maybeWrapped);
+  let isDeleteOperation = false;
+  const parentIsCall = parentPath.isCallExpression({
+    callee: maybeWrapped.node
+  }) && path.isOptionalMemberExpression();
+  const optionals = [];
+  let optionalPath = path;
+  if (scope.path.isPattern() && needsMemoize(optionalPath)) {
+    path.replaceWith(core.template.ast`(() => ${path.node})()`);
+    return;
+  }
+  while (optionalPath.isOptionalMemberExpression() || optionalPath.isOptionalCallExpression()) {
+    const {
+      node
+    } = optionalPath;
+    if (node.optional) {
+      optionals.push(node);
+    }
+    if (optionalPath.isOptionalMemberExpression()) {
+      optionalPath.node.type = "MemberExpression";
+      optionalPath = helperSkipTransparentExpressionWrappers.skipTransparentExprWrappers(optionalPath.get("object"));
+    } else if (optionalPath.isOptionalCallExpression()) {
+      optionalPath.node.type = "CallExpression";
+      optionalPath = helperSkipTransparentExpressionWrappers.skipTransparentExprWrappers(optionalPath.get("callee"));
+    }
+  }
+  let replacementPath = path;
+  if (parentPath.isUnaryExpression({
+    operator: "delete"
+  })) {
+    replacementPath = parentPath;
+    isDeleteOperation = true;
+  }
+  for (let i = optionals.length - 1; i >= 0; i--) {
+    const node = optionals[i];
+    const isCall = core.types.isCallExpression(node);
+    const chainWithTypes = isCall ? node.callee : node.object;
+    const chain = helperSkipTransparentExpressionWrappers.skipTransparentExprWrapperNodes(chainWithTypes);
+    let ref;
+    let check;
+    if (isCall && core.types.isIdentifier(chain, {
+      name: "eval"
+    })) {
+      check = ref = chain;
+      node.callee = core.types.sequenceExpression([core.types.numericLiteral(0), ref]);
+    } else if (pureGetters && isCall && isSimpleMemberExpression(chain)) {
+      check = ref = node.callee;
+    } else {
+      ref = scope.maybeGenerateMemoised(chain);
+      if (ref) {
+        check = core.types.assignmentExpression("=", core.types.cloneNode(ref), chainWithTypes);
+        isCall ? node.callee = ref : node.object = ref;
+      } else {
+        check = ref = chainWithTypes;
+      }
+    }
+    if (isCall && core.types.isMemberExpression(chain)) {
+      if (pureGetters && isSimpleMemberExpression(chain)) {
+        node.callee = chainWithTypes;
+      } else {
+        const {
+          object
+        } = chain;
+        let context;
+        if (core.types.isSuper(object)) {
+          context = core.types.thisExpression();
+        } else {
+          const memoized = scope.maybeGenerateMemoised(object);
+          if (memoized) {
+            context = memoized;
+            chain.object = core.types.assignmentExpression("=", memoized, object);
+          } else {
+            context = object;
+          }
+        }
+        node.arguments.unshift(core.types.cloneNode(context));
+        node.callee = core.types.memberExpression(node.callee, core.types.identifier("call"));
+      }
+    }
+    let replacement = replacementPath.node;
+    if (i === 0 && parentIsCall) {
+      var _baseRef;
+      const object = helperSkipTransparentExpressionWrappers.skipTransparentExprWrapperNodes(replacement.object);
+      let baseRef;
+      if (!pureGetters || !isSimpleMemberExpression(object)) {
+        baseRef = scope.maybeGenerateMemoised(object);
+        if (baseRef) {
+          replacement.object = core.types.assignmentExpression("=", baseRef, object);
+        }
+      }
+      replacement = core.types.callExpression(core.types.memberExpression(replacement, core.types.identifier("bind")), [core.types.cloneNode((_baseRef = baseRef) != null ? _baseRef : object)]);
+    }
+    if (willReplacementCastToBoolean) {
+      const nonNullishCheck = noDocumentAll ? ast`${core.types.cloneNode(check)} != null` : ast`
+            ${core.types.cloneNode(check)} !== null && ${core.types.cloneNode(ref)} !== void 0`;
+      replacementPath.replaceWith(core.types.logicalExpression("&&", nonNullishCheck, replacement));
+      replacementPath = helperSkipTransparentExpressionWrappers.skipTransparentExprWrappers(replacementPath.get("right"));
+    } else {
+      const nullishCheck = noDocumentAll ? ast`${core.types.cloneNode(check)} == null` : ast`
+            ${core.types.cloneNode(check)} === null || ${core.types.cloneNode(ref)} === void 0`;
+      const returnValue = isDeleteOperation ? ast`true` : ast`void 0`;
+      replacementPath.replaceWith(core.types.conditionalExpression(nullishCheck, returnValue, replacement));
+      replacementPath = helperSkipTransparentExpressionWrappers.skipTransparentExprWrappers(replacementPath.get("alternate"));
+    }
+  }
+}
+
+var index = helperPluginUtils.declare((api, options) => {
+  var _api$assumption, _api$assumption2;
+  api.assertVersion(7);
+  const {
+    loose = false
+  } = options;
+  const noDocumentAll = (_api$assumption = api.assumption("noDocumentAll")) != null ? _api$assumption : loose;
+  const pureGetters = (_api$assumption2 = api.assumption("pureGetters")) != null ? _api$assumption2 : loose;
+  return {
+    name: "proposal-optional-chaining",
+    inherits: syntaxOptionalChaining.default,
+    visitor: {
+      "OptionalCallExpression|OptionalMemberExpression"(path) {
+        transform(path, {
+          noDocumentAll,
+          pureGetters
+        });
+      }
+    }
+  };
+});
+
+exports["default"] = index;
+exports.transform = transform;
+//# sourceMappingURL=index.js.map

frontend/node_modules/@babel/plugin-proposal-optional-chaining/package.json

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+{
+  "name": "@babel/plugin-proposal-optional-chaining",
+  "version": "7.21.0",
+  "description": "Transform optional chaining operators into a series of nil checks",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/babel/babel.git",
+    "directory": "packages/babel-plugin-proposal-optional-chaining"
+  },
+  "homepage": "https://babel.dev/docs/en/next/babel-plugin-proposal-optional-chaining",
+  "license": "MIT",
+  "publishConfig": {
+    "access": "public"
+  },
+  "main": "./lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ],
+  "dependencies": {
+    "@babel/helper-plugin-utils": "^7.20.2",
+    "@babel/helper-skip-transparent-expression-wrappers": "^7.20.0",
+    "@babel/plugin-syntax-optional-chaining": "^7.8.3"
+  },
+  "peerDependencies": {
+    "@babel/core": "^7.0.0-0"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.21.0",
+    "@babel/helper-plugin-test-runner": "^7.18.6",
+    "@babel/plugin-transform-block-scoping": "^7.21.0",
+    "@babel/traverse": "^7.21.0"
+  },
+  "engines": {
+    "node": ">=6.9.0"
+  },
+  "author": "The Babel Team (https://babel.dev/team)",
+  "type": "commonjs"
+}