feat(skills): unified management architecture with SSOT and React Query

- Introduce SSOT (Single Source of Truth) at ~/.cc-switch/skills/
- Add three-app toggle support (Claude/Codex/Gemini) for each skill
- Refactor frontend to use TanStack Query hooks instead of manual state
- Add UnifiedSkillsPanel for managing installed skills with app toggles
- Add useSkills.ts with declarative data fetching hooks
- Extend skills.ts API with unified install/uninstall/toggle methods
- Support importing unmanaged skills from app directories
- Add v2→v3 database migration for new skills table structure

src/lib/api/skills.ts

@@ -1,5 +1,51 @@
 import { invoke } from "@tauri-apps/api/core";
 
+// ========== 类型定义 ==========
+
+export type AppType = "claude" | "codex" | "gemini";
+
+/** Skill 应用启用状态 */
+export interface SkillApps {
+  claude: boolean;
+  codex: boolean;
+  gemini: boolean;
+}
+
+/** 已安装的 Skill（v3.10.0+ 统一结构） */
+export interface InstalledSkill {
+  id: string;
+  name: string;
+  description?: string;
+  directory: string;
+  repoOwner?: string;
+  repoName?: string;
+  repoBranch?: string;
+  readmeUrl?: string;
+  apps: SkillApps;
+  installedAt: number;
+}
+
+/** 可发现的 Skill（来自仓库） */
+export interface DiscoverableSkill {
+  key: string;
+  name: string;
+  description: string;
+  directory: string;
+  readmeUrl?: string;
+  repoOwner: string;
+  repoName: string;
+  repoBranch: string;
+}
+
+/** 未管理的 Skill（用于导入） */
+export interface UnmanagedSkill {
+  directory: string;
+  name: string;
+  description?: string;
+  foundIn: string[];
+}
+
+/** 技能对象（兼容旧 API） */
 export interface Skill {
   key: string;
   name: string;
@@ -12,6 +58,7 @@ export interface Skill {
   repoBranch?: string;
 }
 
+/** 仓库配置 */
 export interface SkillRepo {
   owner: string;
   name: string;
@@ -19,9 +66,56 @@ export interface SkillRepo {
   enabled: boolean;
 }
 
-export type AppType = "claude" | "codex" | "gemini";
+// ========== API ==========
 
 export const skillsApi = {
+  // ========== 统一管理 API (v3.10.0+) ==========
+
+  /** 获取所有已安装的 Skills */
+  async getInstalled(): Promise<InstalledSkill[]> {
+    return await invoke("get_installed_skills");
+  },
+
+  /** 安装 Skill（统一安装） */
+  async installUnified(
+    skill: DiscoverableSkill,
+    currentApp: AppType,
+  ): Promise<InstalledSkill> {
+    return await invoke("install_skill_unified", { skill, currentApp });
+  },
+
+  /** 卸载 Skill（统一卸载） */
+  async uninstallUnified(id: string): Promise<boolean> {
+    return await invoke("uninstall_skill_unified", { id });
+  },
+
+  /** 切换 Skill 的应用启用状态 */
+  async toggleApp(
+    id: string,
+    app: AppType,
+    enabled: boolean,
+  ): Promise<boolean> {
+    return await invoke("toggle_skill_app", { id, app, enabled });
+  },
+
+  /** 扫描未管理的 Skills */
+  async scanUnmanaged(): Promise<UnmanagedSkill[]> {
+    return await invoke("scan_unmanaged_skills");
+  },
+
+  /** 从应用目录导入 Skills */
+  async importFromApps(directories: string[]): Promise<InstalledSkill[]> {
+    return await invoke("import_skills_from_apps", { directories });
+  },
+
+  /** 发现可安装的 Skills（从仓库获取） */
+  async discoverAvailable(): Promise<DiscoverableSkill[]> {
+    return await invoke("discover_available_skills");
+  },
+
+  // ========== 兼容旧 API ==========
+
+  /** 获取技能列表（兼容旧 API） */
   async getAll(app: AppType = "claude"): Promise<Skill[]> {
     if (app === "claude") {
       return await invoke("get_skills");
@@ -29,6 +123,7 @@ export const skillsApi = {
     return await invoke("get_skills_for_app", { app });
   },
 
+  /** 安装技能（兼容旧 API） */
   async install(directory: string, app: AppType = "claude"): Promise<boolean> {
     if (app === "claude") {
       return await invoke("install_skill", { directory });
@@ -36,6 +131,7 @@ export const skillsApi = {
     return await invoke("install_skill_for_app", { app, directory });
   },
 
+  /** 卸载技能（兼容旧 API） */
   async uninstall(
     directory: string,
     app: AppType = "claude",
@@ -46,14 +142,19 @@ export const skillsApi = {
     return await invoke("uninstall_skill_for_app", { app, directory });
   },
 
+  // ========== 仓库管理 ==========
+
+  /** 获取仓库列表 */
   async getRepos(): Promise<SkillRepo[]> {
     return await invoke("get_skill_repos");
   },
 
+  /** 添加仓库 */
   async addRepo(repo: SkillRepo): Promise<boolean> {
     return await invoke("add_skill_repo", { repo });
   },
 
+  /** 删除仓库 */
   async removeRepo(owner: string, name: string): Promise<boolean> {
     return await invoke("remove_skill_repo", { owner, name });
   },