fix(tauri): update @reserved annotations + remove dead SaaS client methods

- Update 9 @reserved → @connected for commands with frontend consumers:
  zclaw_status, zclaw_start, zclaw_stop, zclaw_restart, zclaw_doctor,
  viking_add_with_metadata, viking_store_with_summaries,
  trigger_execute, scheduled_task_create
- Remove 10 dead SaaS client methods with zero callers:
  healthCheck, listDevices (saas-client.ts)
  getRelayTask, getUsage/relay (saas-relay.ts)
  listPrompts, getPrompt, listPromptVersions, getPromptVersion (saas-prompt.ts)
  getPlan, getUsage/billing (saas-billing.ts)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

desktop/src-tauri/src/gateway/commands.rs

@@ -52,14 +52,14 @@ pub(crate) struct ProcessLogsResponse {
 }
 
 /// Get ZCLAW Kernel status
-// @reserved: 暂无前端集成
+// @connected
 #[tauri::command]
 pub fn zclaw_status(app: AppHandle) -> Result<LocalGatewayStatus, String> {
     read_gateway_status(&app)
 }
 
 /// Start ZCLAW Kernel
-// @reserved: 暂无前端集成
+// @connected
 #[tauri::command]
 pub fn zclaw_start(app: AppHandle) -> Result<LocalGatewayStatus, String> {
     ensure_local_gateway_ready_for_tauri(&app)?;
@@ -69,7 +69,7 @@ pub fn zclaw_start(app: AppHandle) -> Result<LocalGatewayStatus, String> {
 }
 
 /// Stop ZCLAW Kernel
-// @reserved: 暂无前端集成
+// @connected
 #[tauri::command]
 pub fn zclaw_stop(app: AppHandle) -> Result<LocalGatewayStatus, String> {
     run_zclaw(&app, &["gateway", "stop", "--json"])?;
@@ -78,7 +78,7 @@ pub fn zclaw_stop(app: AppHandle) -> Result<LocalGatewayStatus, String> {
 }
 
 /// Restart ZCLAW Kernel
-// @reserved: 暂无前端集成
+// @connected
 #[tauri::command]
 pub fn zclaw_restart(app: AppHandle) -> Result<LocalGatewayStatus, String> {
     ensure_local_gateway_ready_for_tauri(&app)?;
@@ -114,7 +114,7 @@ pub fn zclaw_approve_device_pairing(
 }
 
 /// Run ZCLAW doctor to diagnose issues
-// @reserved: 暂无前端集成
+// @connected
 #[tauri::command]
 pub fn zclaw_doctor(app: AppHandle) -> Result<String, String> {
     let result = run_zclaw(&app, &["doctor", "--json"])?;