feat(imitation): add article imitation create flow

Introduce 仿写创作: new list and create views, backend imitation service
and prompt templates, worker task routing for imitation jobs, and one-click
rewrite triggers from question citation sources. Surface source article
URL/title on article list/detail, and restrict failed articles to delete-only.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/admin-web/src/router/index.ts

@@ -94,6 +94,26 @@ const router = createRouter({
             navKey: "/articles/free-create",
           },
         },
+        {
+          path: "articles/imitations",
+          name: "articles-imitations",
+          component: () => import("@/views/ImitationView.vue"),
+          meta: {
+            titleKey: "route.imitation.title",
+            descriptionKey: "route.imitation.description",
+            navKey: "/articles/imitations",
+          },
+        },
+        {
+          path: "articles/imitations/create",
+          name: "article-imitation-create",
+          component: () => import("@/views/ImitationGenerateView.vue"),
+          meta: {
+            titleKey: "route.imitationCreate.title",
+            descriptionKey: "route.imitationCreate.description",
+            navKey: "/articles/imitations",
+          },
+        },
         {
           path: "media",
           name: "media",