Add genlocke list and detail pages

Add GET /genlockes and GET /genlockes/{id} endpoints with aggregate
encounter/death stats per leg, and a frontend list page at /genlockes
plus a detail page at /genlockes/:genlockeId showing progress timeline,
cumulative stats, configuration, retired families, and quick actions.
Update nav link to point to the list page instead of /genlockes/new.

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

frontend/src/components/Layout.tsx

@@ -29,7 +29,7 @@ export function Layout() {
                 My Runs
               </Link>
               <Link
-                to="/genlockes/new"
+                to="/genlockes"
                 className="px-3 py-2 rounded-md text-sm font-medium hover:bg-gray-100 dark:hover:bg-gray-700"
               >
                 Genlockes
@@ -100,7 +100,7 @@ export function Layout() {
                 My Runs
               </Link>
               <Link
-                to="/genlockes/new"
+                to="/genlockes"
                 onClick={() => setMenuOpen(false)}
                 className="block px-3 py-2 rounded-md text-base font-medium hover:bg-gray-100 dark:hover:bg-gray-700"
               >