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/config.rs

@@ -1,6 +1,6 @@
 use serde::Deserialize;
 
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Clone, Deserialize)]
 pub struct AppConfig {
     pub server: ServerConfig,
     pub database: DatabaseConfig,
@@ -9,32 +9,32 @@ pub struct AppConfig {
     pub log: LogConfig,
 }
 
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Clone, Deserialize)]
 pub struct ServerConfig {
     pub host: String,
     pub port: u16,
 }
 
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Clone, Deserialize)]
 pub struct DatabaseConfig {
     pub url: String,
     pub max_connections: u32,
     pub min_connections: u32,
 }
 
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Clone, Deserialize)]
 pub struct RedisConfig {
     pub url: String,
 }
 
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Clone, Deserialize)]
 pub struct JwtConfig {
     pub secret: String,
     pub access_token_ttl: String,
     pub refresh_token_ttl: String,
 }
 
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Clone, Deserialize)]
 pub struct LogConfig {
     pub level: String,
 }