feat(skills): add baoyu-skills preset repo and auto-supplement missing defaults

- Add JimLiu/baoyu-skills to default skill repositories
- Change init_default_skill_repos() from "first-run only" to "supplement missing"
- New preset repos will now auto-appear for existing users on upgrade

src-tauri/src/database/dao/skills.rs

@@ -203,24 +203,32 @@ impl Database {
         Ok(())
     }
 
-    /// 初始化默认的 Skill 仓库（首次启动时调用）
+    /// 初始化默认的 Skill 仓库（启动时调用，补充缺失的默认仓库）
     pub fn init_default_skill_repos(&self) -> Result<usize, AppError> {
-        // 检查是否已有仓库
+        // 获取已有仓库列表
         let existing = self.get_skill_repos()?;
-        if !existing.is_empty() {
-            return Ok(0);
-        }
+        let existing_keys: std::collections::HashSet<(String, String)> = existing
+            .iter()
+            .map(|r| (r.owner.clone(), r.name.clone()))
+            .collect();
 
         // 获取默认仓库列表
         let default_store = crate::services::skill::SkillStore::default();
         let mut count = 0;
 
+        // 仅插入缺失的默认仓库
         for repo in &default_store.repos {
-            self.save_skill_repo(repo)?;
-            count += 1;
+            let key = (repo.owner.clone(), repo.name.clone());
+            if !existing_keys.contains(&key) {
+                self.save_skill_repo(repo)?;
+                count += 1;
+                log::info!("补充默认 Skill 仓库: {}/{}", repo.owner, repo.name);
+            }
         }
 
-        log::info!("初始化默认 Skill 仓库完成，共 {count} 个");
+        if count > 0 {
+            log::info!("补充默认 Skill 仓库完成，新增 {count} 个");
+        }
         Ok(count)
     }
 }

src-tauri/src/services/skill.rs

@@ -128,6 +128,12 @@ impl Default for SkillStore {
                     branch: "master".to_string(),
                     enabled: true,
                 },
+                SkillRepo {
+                    owner: "JimLiu".to_string(),
+                    name: "baoyu-skills".to_string(),
+                    branch: "main".to_string(),
+                    enabled: true,
+                },
             ],
         }
     }