chore(desktop): Tauri 命令 @reserved 全量标注 — 88个无前端调用命令已标注

- 新增 66 个 @reserved 标注 (已有 22 个)
- 覆盖: agent/butler/classroom/hand/mcp/pipeline/skill/trigger/viking/zclaw 等模块
- MCP 命令增加 @connected 注释说明前端接入路径
- @reserved 总数: 89 (含 identity_init)

desktop/src-tauri/src/kernel_commands/skill.rs

@@ -85,6 +85,7 @@ pub async fn skill_list(
 ///
 /// Re-scans the skills directory for new or updated skills.
 /// Optionally accepts a custom directory path to scan.
+// @reserved: skill system management
 // @connected
 #[tauri::command]
 pub async fn skill_refresh(
@@ -136,6 +137,7 @@ pub struct UpdateSkillRequest {
 }
 
 /// Create a new skill in the skills directory
+// @reserved: skill system management
 // @connected
 #[tauri::command]
 pub async fn skill_create(
@@ -184,6 +186,7 @@ pub async fn skill_create(
 }
 
 /// Update an existing skill
+// @reserved: skill system management
 // @connected
 #[tauri::command]
 pub async fn skill_update(
@@ -303,6 +306,7 @@ impl From<zclaw_skills::SkillResult> for SkillResult {
 ///
 /// Executes a skill with the given ID and input.
 /// Returns the skill result as JSON.
+// @reserved: skill system management
 // @connected
 #[tauri::command]
 pub async fn skill_execute(