feat(admin): add Memory V2 personal controls and Skill Runtime page

Wire admin UI and API routes to restored Memind personal memory and skill
runtime modules, including candidate review and runtime status display.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/admin/AdminNav.tsx

@@ -29,6 +29,7 @@ const NAV_SECTIONS: NavSection[] = [
       { to: '/wechat', label: '服务号' },
       { to: '/mindspace', label: 'MindSpace 配置' },
       { to: '/memory-v2', label: 'Memory V2' },
+      { to: '/skill-runtime', label: 'Skill Runtime' },
       { to: '/system-tests', label: '系统测试验证' },
       { to: '/capabilities', label: '能力' },
       { to: '/skills', label: '技能' },