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-common/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "erp-common"
+version.workspace = true
+edition.workspace = true
+
+[dependencies]
+uuid.workspace = true
+chrono.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+tracing.workspace = true

crates/erp-common/src/lib.rs

@@ -0,0 +1 @@
+pub mod utils;

crates/erp-common/src/utils.rs

@@ -0,0 +1 @@
+/// Shared utility functions for the ERP platform.