feat: 导入的 skills 默认存到 ~/.ias/skills/

- Import/Delete 目标改为 ~/.ias/skills/（全局共享）
- SkillRegistry::load() 返回 (Self, Vec<String>) 替代 Result
  允许部分加载：格式不兼容的 skill 记录警告但不阻止加载
- 新增 global_skills_dir() 辅助函数

src/main.rs

@@ -206,15 +206,13 @@ async fn cmd_listen(
     }
 
     // 加载系统 Skills
-    let skill_registry = match SkillRegistry::load("resources/skills", "skills").await {
-        Ok(r) => {
-            info!("已加载 {} 个技能", r.count());
-            Some(Arc::new(r))
-        }
-        Err(e) => {
-            info!("技能加载结果: {:?}", e);
-            None
+    let (skill_registry, _warnings) = SkillRegistry::load("resources/skills", "skills").await;
+    let skill_registry = {
+        if !_warnings.is_empty() {
+            info!("技能加载警告: {:?}", _warnings);
         }
+        info!("已加载 {} 个技能", skill_registry.count());
+        Some(Arc::new(skill_registry))
     };
 
     // 审批管理器
@@ -795,10 +793,19 @@ async fn cmd_send(
     }
 }
 
+fn global_skills_dir() -> std::path::PathBuf {
+    dirs::home_dir()
+        .unwrap_or_else(|| std::path::PathBuf::from("."))
+        .join(".ias")
+        .join("skills")
+}
+
 async fn cmd_skills(action: SkillsAction) {
     use dialoguer::{MultiSelect, theme::ColorfulTheme};
     use console::Term;
 
+    let global_dir = global_skills_dir();
+
     match action {
         SkillsAction::List => {
             let discovered = skills_importer::discover_skills();
@@ -833,8 +840,8 @@ async fn cmd_skills(action: SkillsAction) {
                 return;
             }
 
-            let dest = std::path::PathBuf::from("skills");
-            std::fs::create_dir_all(&dest).ok();
+            let dest = &global_dir;
+            std::fs::create_dir_all(dest).ok();
 
             let mut imported = 0;
             let mut skipped = 0;
@@ -852,18 +859,16 @@ async fn cmd_skills(action: SkillsAction) {
                     }
                 }
             }
-            println!("\n完成：导入 {imported} 个，跳过 {skipped} 个");
-            println!("重启 iAs 后生效");
+            println!("\n完成：导入 {imported} 个，跳过 {skipped} 个 (→ {})", global_dir.display());
         }
         SkillsAction::Delete => {
-            let skills_dir = std::path::PathBuf::from("skills");
-            if !skills_dir.exists() {
-                println!("skills 目录不存在，没有可删除的 Skill");
+            if !global_dir.exists() {
+                println!("全局 skills 目录不存在，没有可删除的 Skill");
                 return;
             }
 
             let mut entries: Vec<(String, String)> = Vec::new();
-            if let Ok(dir) = std::fs::read_dir(&skills_dir) {
+            if let Ok(dir) = std::fs::read_dir(&global_dir) {
                 for entry in dir.flatten() {
                     let path = entry.path();
                     if path.is_dir() && path.join("SKILL.md").exists() {
@@ -901,7 +906,7 @@ async fn cmd_skills(action: SkillsAction) {
             let mut deleted = 0;
             for idx in selection {
                 let (name, _) = &entries[idx];
-                let path = skills_dir.join(name);
+                let path = global_dir.join(name);
                 match std::fs::remove_dir_all(&path) {
                     Ok(_) => {
                         println!("  ✅ 已删除 {name}");