📦 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/tslib/modules/index.d.ts

@@ -0,0 +1,38 @@
+// Note: named reexports are used instead of `export *` because
+// TypeScript itself doesn't resolve the `export *` when checking
+// if a particular helper exists.
+export {
+  __extends,
+  __assign,
+  __rest,
+  __decorate,
+  __param,
+  __esDecorate,
+  __runInitializers,
+  __propKey,
+  __setFunctionName,
+  __metadata,
+  __awaiter,
+  __generator,
+  __exportStar,
+  __values,
+  __read,
+  __spread,
+  __spreadArrays,
+  __spreadArray,
+  __await,
+  __asyncGenerator,
+  __asyncDelegator,
+  __asyncValues,
+  __makeTemplateObject,
+  __importStar,
+  __importDefault,
+  __classPrivateFieldGet,
+  __classPrivateFieldSet,
+  __classPrivateFieldIn,
+  __createBinding,
+  __addDisposableResource,
+  __disposeResources,
+  __rewriteRelativeImportExtension,
+} from '../tslib.js';
+export * as default from '../tslib.js';

frontend/node_modules/tslib/modules/index.js

@@ -0,0 +1,70 @@
+import tslib from '../tslib.js';
+const {
+    __extends,
+    __assign,
+    __rest,
+    __decorate,
+    __param,
+    __esDecorate,
+    __runInitializers,
+    __propKey,
+    __setFunctionName,
+    __metadata,
+    __awaiter,
+    __generator,
+    __exportStar,
+    __createBinding,
+    __values,
+    __read,
+    __spread,
+    __spreadArrays,
+    __spreadArray,
+    __await,
+    __asyncGenerator,
+    __asyncDelegator,
+    __asyncValues,
+    __makeTemplateObject,
+    __importStar,
+    __importDefault,
+    __classPrivateFieldGet,
+    __classPrivateFieldSet,
+    __classPrivateFieldIn,
+    __addDisposableResource,
+    __disposeResources,
+    __rewriteRelativeImportExtension,
+} = tslib;
+export {
+    __extends,
+    __assign,
+    __rest,
+    __decorate,
+    __param,
+    __esDecorate,
+    __runInitializers,
+    __propKey,
+    __setFunctionName,
+    __metadata,
+    __awaiter,
+    __generator,
+    __exportStar,
+    __createBinding,
+    __values,
+    __read,
+    __spread,
+    __spreadArrays,
+    __spreadArray,
+    __await,
+    __asyncGenerator,
+    __asyncDelegator,
+    __asyncValues,
+    __makeTemplateObject,
+    __importStar,
+    __importDefault,
+    __classPrivateFieldGet,
+    __classPrivateFieldSet,
+    __classPrivateFieldIn,
+    __addDisposableResource,
+    __disposeResources,
+    __rewriteRelativeImportExtension,
+};
+export default tslib;

frontend/node_modules/tslib/modules/package.json

@@ -0,0 +1,3 @@
+{
+    "type": "module"
+}