refactor: strip AI pipeline to binary photo/other classifier

Drops face recognition, OCR, object detection, and semantic embeddings.
The sole remaining vision task is a CLIP-based binary classifier
(photography vs other); photos in "other" get needs_review=true so
screenshots, documents, memes and scans can be triaged from a new
filter pill in the UI.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/hooks/useFeaturesQuery.ts

@@ -18,14 +18,7 @@ export function useFeaturesQuery() {
   })
 }
 
-export function useIsFeatureEnabled(
-  name:
-    | 'vision.enabled'
-    | 'vision.ocr.enabled'
-    | 'vision.detector.enabled'
-    | 'vision.faces.enabled'
-    | 'vision.classifier.enabled',
-): boolean {
+export function useIsFeatureEnabled(name: 'vision.enabled'): boolean {
   const { data } = useFeaturesQuery()
   // Default to enabled while loading so we don't flash "feature off"
   // during a first-paint fetch. The backend is the source of truth;

frontend/src/hooks/useFilterUrlSync.ts

@@ -89,6 +89,7 @@ function parseUrl(): HydratePayload {
   }
 
   if (sp.get('duplicates') === 'true') out.duplicates = true
+  if (sp.get('needs_review') === 'true') out.needsReview = true
 
   const groupBy = sp.get('group')
   if (groupBy === 'date' || groupBy === 'tag') out.groupBy = groupBy
@@ -123,6 +124,7 @@ function writeUrl(f: FilterState & { currentSection?: string }) {
   if (f.folderId) sp.set('folder_id', f.folderId)
   if (f.tagIds.length > 0) sp.set('tag_ids', f.tagIds.join(','))
   if (f.duplicates) sp.set('duplicates', 'true')
+  if (f.needsReview) sp.set('needs_review', 'true')
   if (f.groupBy !== 'date') sp.set('group', f.groupBy)
   if (f.currentSection && f.currentSection !== 'all-photos')
     sp.set('section', f.currentSection)

frontend/src/hooks/usePhotosQuery.ts

@@ -52,6 +52,7 @@ export function usePhotosQuery() {
   const folderId = useFilterStore((s) => s.folderId)
   const tagIds = useFilterStore((s) => s.tagIds)
   const duplicates = useFilterStore((s) => s.duplicates)
+  const needsReview = useFilterStore((s) => s.needsReview)
   const groupBy = useFilterStore((s) => s.groupBy)
   const sortBy = useFilterStore((s) => s.sortBy)
   const sortOrder = useFilterStore((s) => s.sortOrder)
@@ -71,11 +72,12 @@ export function usePhotosQuery() {
         folderId,
         tagIds,
         duplicates,
+        needsReview,
         groupBy,
         sortBy,
         sortOrder,
       }),
-    [q, dateFrom, dateTo, mediaTypes, ratingMin, ratingMax, colorLabel, flag, heapId, folderId, tagIds, duplicates, groupBy, sortBy, sortOrder]
+    [q, dateFrom, dateTo, mediaTypes, ratingMin, ratingMax, colorLabel, flag, heapId, folderId, tagIds, duplicates, needsReview, groupBy, sortBy, sortOrder]
   )
 
   const queryClient = useQueryClient()