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)

Cargo.toml

@@ -27,6 +27,7 @@ members = [
     "kubernetes",
     "rhai",
     "herodo",
+    "service_manager",
 ]
 resolver = "2"
 
@@ -103,6 +104,7 @@ sal-virt = { path = "virt", optional = true }
 sal-postgresclient = { path = "postgresclient", optional = true }
 sal-vault = { path = "vault", optional = true }
 sal-rhai = { path = "rhai", optional = true }
+sal-service-manager = { path = "service_manager", optional = true }
 
 [features]
 default = []
@@ -121,11 +123,12 @@ virt = ["dep:sal-virt"]
 postgresclient = ["dep:sal-postgresclient"]
 vault = ["dep:sal-vault"]
 rhai = ["dep:sal-rhai"]
+service_manager = ["dep:sal-service-manager"]
 
 # Convenience feature groups
 core = ["os", "process", "text", "net"]
 clients = ["redisclient", "postgresclient", "zinit_client", "mycelium"]
-infrastructure = ["git", "vault", "kubernetes", "virt"]
+infrastructure = ["git", "vault", "kubernetes", "virt", "service_manager"]
 scripting = ["rhai"]
 all = [
     "git",
@@ -141,4 +144,5 @@ all = [
     "postgresclient",
     "vault",
     "rhai",
+    "service_manager",
 ]