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-core/src/events.rs

@@ -0,0 +1,61 @@
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use tokio::sync::broadcast;
+use tracing::{error, info};
+use uuid::Uuid;
+
+/// 领域事件
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct DomainEvent {
+    pub id: Uuid,
+    pub event_type: String,
+    pub tenant_id: Uuid,
+    pub payload: serde_json::Value,
+    pub timestamp: DateTime<Utc>,
+    pub correlation_id: Uuid,
+}
+
+impl DomainEvent {
+    pub fn new(event_type: impl Into<String>, tenant_id: Uuid, payload: serde_json::Value) -> Self {
+        Self {
+            id: Uuid::now_v7(),
+            event_type: event_type.into(),
+            tenant_id,
+            payload,
+            timestamp: Utc::now(),
+            correlation_id: Uuid::now_v7(),
+        }
+    }
+}
+
+/// 事件处理器 trait
+pub trait EventHandler: Send + Sync {
+    fn event_types(&self) -> Vec<String>;
+    fn handle(&self, event: &DomainEvent) -> impl std::future::Future<Output = anyhow::Result<()>> + Send;
+}
+
+/// 进程内事件总线
+#[derive(Clone)]
+pub struct EventBus {
+    sender: broadcast::Sender<DomainEvent>,
+}
+
+impl EventBus {
+    pub fn new(capacity: usize) -> Self {
+        let (sender, _) = broadcast::channel(capacity);
+        Self { sender }
+    }
+
+    /// 发布事件
+    pub fn publish(&self, event: DomainEvent) {
+        info!(event_type = %event.event_type, event_id = %event.id, "Event published");
+        if let Err(e) = self.sender.send(event) {
+            error!("Failed to publish event: {}", e);
+        }
+    }
+
+    /// 订阅所有事件，返回接收端
+    pub fn subscribe(&self) -> broadcast::Receiver<DomainEvent> {
+        self.sender.subscribe()
+    }
+}