docs: 添加中文文档，新增前端和后端代码

- 新增 README_CN.md 中文文档
- 新增 frontend/ Vue 3 前端项目
- 新增 web/ FastAPI 后端项目

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/tsconfig.node.json

@@ -0,0 +1,19 @@
+{
+  "extends": "@tsconfig/node24/tsconfig.json",
+  "include": [
+    "vite.config.*",
+    "vitest.config.*",
+    "cypress.config.*",
+    "nightwatch.conf.*",
+    "playwright.config.*",
+    "eslint.config.*"
+  ],
+  "compilerOptions": {
+    "noEmit": true,
+    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.node.tsbuildinfo",
+
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "types": ["node"]
+  }
+}