feat: Add service manager support

- Add a new service manager crate for dynamic service management
- Integrate service manager with Rhai for scripting
- Provide examples for circle worker management and basic usage
- Add comprehensive tests for service lifecycle and error handling
- Implement cross-platform support for macOS and Linux (zinit/systemd)

rhai/src/lib.rs

@@ -103,6 +103,9 @@ pub use sal_vault::rhai::register_crypto_module;
 pub use sal_kubernetes::rhai::register_kubernetes_module;
 pub use sal_kubernetes::KubernetesManager;
 
+// Re-export service manager module
+pub use sal_service_manager::rhai::register_service_manager_module;
+
 // Rename copy functions to avoid conflicts
 pub use sal_os::rhai::copy as os_copy;
 
@@ -167,6 +170,9 @@ pub fn register(engine: &mut Engine) -> Result<(), Box<rhai::EvalAltResult>> {
     // Register PostgreSQL client module functions
     sal_postgresclient::rhai::register_postgresclient_module(engine)?;
 
+    // Register Service Manager module functions
+    sal_service_manager::rhai::register_service_manager_module(engine)?;
+
     // Platform functions are now registered by sal-os package
 
     // Screen module functions are now part of sal-process package