feat(aether-proxy): 支持 Alpine 主机服务安装与 musl 发布 (#291)

* feat(aether-proxy): 支持 Alpine 主机服务安装与 musl 发布

* fix(aether-proxy): address alpine support review findings

apps/aether-proxy/src/setup/tui.rs

@@ -28,7 +28,7 @@ use crate::config::{
 
 /// Outcome of the setup wizard, returned to the caller.
 pub enum SetupOutcome {
-    /// Config saved; systemd service installed and started.
+    /// Config saved and the selected host service was installed.
     ServiceInstalled,
     /// Config saved; no service -- caller should start the proxy directly.
     ReadyToRun(PathBuf),
@@ -148,7 +148,7 @@ impl App {
                     .into(),
                     kind: FieldKind::Bool,
                     required: false,
-                    help: "Install as systemd service (requires root) -- Enter to toggle",
+                    help: "Install as managed service (requires root) -- Enter to toggle",
                 },
                 Field {
                     label: "Log Level",
@@ -532,11 +532,8 @@ impl App {
                             && toggled == "true"
                             && !super::service::is_available()
                         {
-                            self.message = Some((
-                                "requires root with systemd, use: sudo aether-proxy setup".into(),
-                                Instant::now(),
-                                true,
-                            ));
+                            self.message =
+                                Some((super::service::unavailable_hint(), Instant::now(), true));
                         } else {
                             self.selected_field_mut().value = toggled.into();
                             self.modified = true;