📦 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/hooks/tapErrorToLogMessage.js

@@ -0,0 +1,27 @@
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+const pluginHooks_1 = require("./pluginHooks");
+const RpcIpcMessagePortClosedError_1 = require("../rpc/rpc-ipc/error/RpcIpcMessagePortClosedError");
+const chalk_1 = __importDefault(require("chalk"));
+function tapErrorToLogMessage(compiler, configuration) {
+    const hooks = pluginHooks_1.getForkTsCheckerWebpackPluginHooks(compiler);
+    hooks.error.tap('ForkTsCheckerWebpackPlugin', (error) => {
+        configuration.logger.issues.error(String(error));
+        if (error instanceof RpcIpcMessagePortClosedError_1.RpcIpcMessagePortClosedError) {
+            if (error.signal === 'SIGINT') {
+                configuration.logger.issues.error(chalk_1.default.red('Issues checking service interrupted - If running in a docker container, this may be caused ' +
+                    "by the container running out of memory. If so, try increasing the container's memory limit " +
+                    'or lowering the `memoryLimit` value in the ForkTsCheckerWebpackPlugin configuration.'));
+            }
+            else {
+                configuration.logger.issues.error(chalk_1.default.red('Issues checking service aborted - probably out of memory. ' +
+                    'Check the `memoryLimit` option in the ForkTsCheckerWebpackPlugin configuration.\n' +
+                    "If increasing the memory doesn't solve the issue, it's most probably a bug in the TypeScript or EsLint."));
+            }
+        }
+    });
+}
+exports.tapErrorToLogMessage = tapErrorToLogMessage;