feat: implement hybrid database architecture and frontend encryption

- Add PostgreSQL + SQLite hybrid database support with automatic switching
- Implement frontend AES-GCM + RSA-OAEP encryption for sensitive data
- Add comprehensive DatabaseInterface with all required methods
- Fix compilation issues with interface consistency
- Update all database method signatures to use DatabaseInterface
- Add missing UpdateTraderInitialBalance method to PostgreSQL implementation
- Integrate RSA public key distribution via /api/config endpoint
- Add frontend crypto service with proper error handling
- Support graceful degradation between encrypted and plaintext transmission
- Add directory creation for RSA keys and PEM parsing fixes
- Test both SQLite and PostgreSQL modes successfully
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: tinkle-community <tinklefund@gmail.com>

docs/getting-started/docker-deploy.zh-CN.md

@@ -55,7 +55,7 @@ docker compose --version  # Docker 24+ 自带，无需单独安装
 
 ```bash
 # 复制配置文件模板
-cp config.example.jsonc config.json
+cp config.json.example config.json
 
 # 编辑配置文件，填入你的 API 密钥
 nano config.json  # 或使用其他编辑器
@@ -270,7 +270,7 @@ kill -9 <PID>
 ls -la config.json
 
 # 如果不存在，复制模板
-cp config.example.jsonc config.json
+cp config.json.example config.json
 ```
 
 ### 健康检查失败