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/App.tsx

@@ -3,7 +3,6 @@ import { Timeline } from './components/timeline/Timeline'
 import { DuplicatesView } from './components/duplicates/DuplicatesView'
 import { MapView } from './components/map/MapView'
 import { MemoriesView } from './components/memories/MemoriesView'
-import { PeopleView } from './components/people/PeopleView'
 import { TagsView } from './components/tags/TagsView'
 import { ColorsView } from './components/colors/ColorsView'
 import { RatedView } from './components/rated/RatedView'
@@ -92,8 +91,6 @@ function MainApp() {
               <MemoriesView />
             ) : currentSection === 'duplicates' ? (
               <DuplicatesView />
-            ) : currentSection === 'people' ? (
-              <PeopleView />
             ) : currentSection === 'tags' ? (
               <TagsView />
             ) : currentSection === 'colors' ? (