📦 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/eslint-module-utils/resolve.d.ts

@@ -0,0 +1,30 @@
+import type { Rule } from 'eslint';
+
+import type ModuleCache from './ModuleCache';
+import type { ESLintSettings } from './types';
+
+export type ResultNotFound = { found: false, path?: undefined };
+export type ResultFound = { found: true, path: string | null };
+export type ResolvedResult = ResultNotFound | ResultFound;
+
+export type ResolverResolve = (modulePath: string, sourceFile:string, config: unknown) => ResolvedResult;
+export type ResolverResolveImport = (modulePath: string, sourceFile:string, config: unknown) => string | undefined;
+export type Resolver = { interfaceVersion?: 1 | 2, resolve: ResolverResolve, resolveImport: ResolverResolveImport };
+
+declare function resolve(
+    p: string,
+    context: Rule.RuleContext,
+): ResolvedResult['path'];
+
+export default resolve;
+
+declare function fileExistsWithCaseSync(
+    filepath: string | null,
+    cacheSettings: ESLintSettings,
+    strict: boolean
+): boolean | ReturnType<typeof ModuleCache.prototype.get>;
+
+declare function relative(modulePath: string, sourceFile: string, settings: ESLintSettings): ResolvedResult['path'];
+
+
+export { fileExistsWithCaseSync, relative };