feat: 初始化ERP平台底座项目结构

- 添加基础crate结构(erp-core, erp-common)
- 实现核心模块trait和事件总线
- 配置Docker开发环境(PostgreSQL+Redis)
- 添加Tauri桌面端基础框架
- 设置CI/CD工作流
- 编写项目协作规范文档(CLAUDE.md)

crates/erp-server/config/default.toml

@@ -0,0 +1,19 @@
+[server]
+host = "0.0.0.0"
+port = 3000
+
+[database]
+url = "postgres://erp:erp_dev_2024@localhost:5432/erp"
+max_connections = 20
+min_connections = 5
+
+[redis]
+url = "redis://localhost:6379"
+
+[jwt]
+secret = "change-me-in-production"
+access_token_ttl = "15m"
+refresh_token_ttl = "7d"
+
+[log]
+level = "info"