refactor(skill): unify scan/import logic with lock file skillPath and repo saving

- Deduplicate scan_unmanaged and import_from_apps using shared source list
- Replace hand-written AppType match with as_str() and AppType::all()
- Extract read_skill_name_desc, build_repo_info_from_lock, save_repos_from_lock helpers
- Add SkillApps::from_labels for building enable state from source labels
- Parse skillPath from .skill-lock.json for correct readme URLs
- Save skill repos to skill_repos table in both import and migration paths

src-tauri/src/app_config.rs

@@ -125,6 +125,20 @@ impl SkillApps {
         apps.set_enabled_for(app, true);
         apps
     }
+
+    /// 从来源标签列表构建启用状态
+    ///
+    /// 标签与 AppType::as_str() 一致时启用对应应用，
+    /// 其他标签（如 "agents", "cc-switch"）忽略。
+    pub fn from_labels(labels: &[String]) -> Self {
+        let mut apps = Self::default();
+        for label in labels {
+            if let Ok(app) = label.parse::<AppType>() {
+                apps.set_enabled_for(&app, true);
+            }
+        }
+        apps
+    }
 }
 
 /// 已安装的 Skill（v3.10.0+ 统一结构）