📦 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/fork-ts-checker-webpack-plugin/lib/ForkTsCheckerWebpackPluginConfiguration.js

@@ -0,0 +1,18 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const IssueConfiguration_1 = require("./issue/IssueConfiguration");
+const formatter_1 = require("./formatter");
+const TypeScriptReporterConfiguration_1 = require("./typescript-reporter/TypeScriptReporterConfiguration");
+const EsLintReporterConfiguration_1 = require("./eslint-reporter/EsLintReporterConfiguration");
+const LoggerConfiguration_1 = require("./logger/LoggerConfiguration");
+function createForkTsCheckerWebpackPluginConfiguration(compiler, options = {}) {
+    return {
+        async: options.async === undefined ? compiler.options.mode === 'development' : options.async,
+        typescript: TypeScriptReporterConfiguration_1.createTypeScriptReporterConfiguration(compiler, options.typescript),
+        eslint: EsLintReporterConfiguration_1.createEsLintReporterConfiguration(compiler, options.eslint),
+        issue: IssueConfiguration_1.createIssueConfiguration(compiler, options.issue),
+        formatter: formatter_1.createFormatterConfiguration(options.formatter),
+        logger: LoggerConfiguration_1.createLoggerConfiguration(compiler, options.logger),
+    };
+}
+exports.createForkTsCheckerWebpackPluginConfiguration = createForkTsCheckerWebpackPluginConfiguration;