feat: 实现 Claude API 透传代理服务

实现完整的 Claude API 代理服务，支持：
- 透传 /v1/* 路径到上游 API
- 流式 (SSE) 和非流式响应
- JSONL 格式请求日志
- /health 健康检查端点
- Docker 多阶段构建
- Gitea Actions CI/CD 工作流

安全加固：
- 容器以非 root 用户运行
- 添加 Docker HEALTHCHECK
- 实现优雅关闭处理 (SIGTERM/SIGINT)

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

package.json

@@ -0,0 +1,30 @@
+{
+  "name": "claude-api-proxy",
+  "version": "1.0.0",
+  "description": "Claude API 透明代理服务",
+  "main": "dist/index.js",
+  "scripts": {
+    "build": "tsc && tsc-alias",
+    "start": "node dist/index.js",
+    "dev": "tsx watch src/index.ts"
+  },
+  "keywords": [
+    "claude",
+    "api",
+    "proxy"
+  ],
+  "author": "",
+  "license": "MIT",
+  "dependencies": {
+    "axios": "^1.7.9",
+    "dotenv": "^16.4.7",
+    "express": "^4.21.2"
+  },
+  "devDependencies": {
+    "@types/express": "^5.0.0",
+    "@types/node": "^22.10.5",
+    "tsc-alias": "^1.8.10",
+    "tsx": "^4.19.2",
+    "typescript": "^5.7.3"
+  }
+}