feat(server): integrate AppState, ModuleRegistry, health check, and graceful shutdown

- Add AppState with DB, Config, EventBus, ModuleRegistry via Axum State
- ModuleRegistry now uses Arc for Clone support, builder-pattern register()
- Add /api/v1/health endpoint returning status, version, registered modules
- Add graceful shutdown on CTRL+C / SIGTERM
- erp-common utils: ID generation, timestamp helpers, code generator with tests
- Config structs now derive Clone for state sharing
- Update wiki to reflect Phase 1 completion

crates/erp-server/src/handlers/health.rs

@@ -0,0 +1,36 @@
+use axum::extract::State;
+use axum::response::Json;
+use axum::routing::get;
+use axum::Router;
+use serde::Serialize;
+
+use crate::state::AppState;
+
+#[derive(Debug, Serialize)]
+pub struct HealthResponse {
+    pub status: String,
+    pub version: String,
+    pub modules: Vec<String>,
+}
+
+/// GET /api/v1/health
+///
+/// 服务健康检查，返回运行状态和已注册模块列表
+pub async fn health_check(State(state): State<AppState>) -> Json<HealthResponse> {
+    let modules = state
+        .module_registry
+        .modules()
+        .iter()
+        .map(|m| m.name().to_string())
+        .collect();
+
+    Json(HealthResponse {
+        status: "ok".to_string(),
+        version: env!("CARGO_PKG_VERSION").to_string(),
+        modules,
+    })
+}
+
+pub fn health_check_router() -> Router<AppState> {
+    Router::new().route("/api/v1/health", get(health_check))
+}

crates/erp-server/src/handlers/mod.rs

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