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/src/main.rs

@@ -0,0 +1,41 @@
+mod config;
+mod db;
+
+use axum::Router;
+use config::AppConfig;
+use tracing_subscriber::EnvFilter;
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    // Load config
+    let config = AppConfig::load()?;
+
+    // Initialize tracing
+    tracing_subscriber::fmt()
+        .with_env_filter(
+            EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| EnvFilter::new(&config.log.level)),
+        )
+        .json()
+        .init();
+
+    tracing::info!("ERP Server starting...");
+
+    // Connect to database
+    let db = db::connect(&config.database).await?;
+
+    // Connect to Redis
+    let _redis_client = redis::Client::open(&config.redis.url[..])?;
+    tracing::info!("Redis client created");
+
+    // Build app
+    let app = Router::new()
+        .fallback(|| async { axum::Json(serde_json::json!({"error": "Not found"})) });
+
+    let addr = format!("{}:{}", config.server.host, config.server.port);
+    let listener = tokio::net::TcpListener::bind(&addr).await?;
+    tracing::info!("Server listening on {}", addr);
+    axum::serve(listener, app).await?;
+
+    Ok(())
+}