Add genlocke admin panel with CRUD endpoints and UI

Backend: PATCH/DELETE genlocke, POST/DELETE legs with order
re-numbering. Frontend: admin list page with status filter,
detail page with inline editing, legs table, and stats display.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/components/admin/AdminLayout.tsx

@@ -5,6 +5,7 @@ const navItems = [
   { to: '/admin/pokemon', label: 'Pokemon' },
   { to: '/admin/evolutions', label: 'Evolutions' },
   { to: '/admin/runs', label: 'Runs' },
+  { to: '/admin/genlockes', label: 'Genlockes' },
 ]
 
 export function AdminLayout() {