📦 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/yargs/locales/pirate.json

@@ -0,0 +1,13 @@
+{
+  "Commands:": "Choose yer command:",
+  "Options:": "Options for me hearties!",
+  "Examples:": "Ex. marks the spot:",
+  "required": "requi-yar-ed",
+  "Missing required argument: %s": {
+    "one": "Ye be havin' to set the followin' argument land lubber: %s",
+    "other": "Ye be havin' to set the followin' arguments land lubber: %s"
+  },
+  "Show help": "Parlay this here code of conduct",
+  "Show version number": "'Tis the version ye be askin' fer",
+  "Arguments %s and %s are mutually exclusive" : "Yon scurvy dogs %s and %s be as bad as rum and a prudish wench"
+}