feat(admin): delete /ai/slug-backfill and redesign /ai/translation-entries

- Delete /ai/slug-backfill route, its surface (SlugBackfillSurface), the
  WriterGeneratePanel helper, the slug-backfill API functions, and all
  related i18n keys. The `AITaskType.SlugBackfill` enum value and the task
  type label are kept so historical tasks still render in /ai/tasks.
- Drop the slug tab from `aiSurfaceTabs`, the slug branch from
  `getInitialAiSurface`, and the 'slug' variant from `AiSurface`.
- Migrate /ai/translation-entries off the legacy AiRouteViewContent tab
  wrapper into a self-contained AiTranslationEntriesRouteView modelled on
  the /posts list shell: FocusScope + ContentListHeader + a custom toolbar
  strip (keyPath select / lang input / refresh) + Scroll table + pagination.
  URL-syncs page/keyPath/lang. The old TranslationEntriesSurface and its
  AiRouteViewContent branch are removed.

Author: Innei

apps/admin/src/api/ai.ts

@@ -507,19 +507,6 @@ export function deleteTranslationEntry(id: string) {
   return deleteJson<void>(`/ai/translations/entries/${id}`)
 }
 
-export function getSlugBackfillStatus() {
-  return getJson<{
-    count: number
-    notes: Array<{ id: string; nid: number; title: string }>
-  }>('/ai/writer/backfill-slugs/status')
-}
-
-export function createSlugBackfillTask() {
-  return requestJson<CreateTaskResponse>('/ai/writer/backfill-slugs', {
-    method: 'POST',
-  })
-}
-
 function normalizeTasksResponse(
   response: AITasksResponse | AITask[],
 ): AITasksResponse {

apps/admin/src/features/ai/components/AiRouteViewContent.tsx

@@ -14,8 +14,6 @@ import {
   TranslationsSurface,
 } from './AiResourceSurfaces'
 import { AiTasksSurface } from './AiTasksSurface'
-import { SlugBackfillSurface } from './SlugBackfillSurface'
-import { TranslationEntriesSurface } from './TranslationEntriesSurface'
 
 export function AiRouteViewContent() {
   const { t } = useI18n()
@@ -68,8 +66,6 @@ export function AiRouteViewContent() {
         {surface === 'summaries' ? <SummariesSurface /> : null}
         {surface === 'translations' ? <TranslationsSurface /> : null}
         {surface === 'insights' ? <InsightsSurface /> : null}
-        {surface === 'entries' ? <TranslationEntriesSurface /> : null}
-        {surface === 'slug' ? <SlugBackfillSurface /> : null}
       </div>
     </AppPage>
   )

apps/admin/src/features/ai/components/SlugBackfillSurface.tsx

@@ -9,7 +9,6 @@ import {
   ListTodo,
   Loader2,
   Sparkles,
-  WandSparkles,
   XCircle,
 } from 'lucide-react'
 import type { TranslationKey } from '~/i18n/types'
@@ -138,12 +137,6 @@ export const aiSurfaceTabs: Array<{
     path: '/ai/translation-entries',
     value: 'entries',
   },
-  {
-    icon: WandSparkles,
-    labelKey: 'ai.tab.slug',
-    path: '/ai/slug-backfill',
-    value: 'slug',
-  },
 ]
 
 export const translationEntryKeyPathOptions = [