Move Order and Display mode to the Photos tab

Both are photos-specific settings (rotation order, how a photo's aspect
ratio gets reconciled with the panel), not device-wide configuration --
they belonged on the Photos tab next to the album/queue settings, not
Configuration. No backend change: both already save through the shared
partial-update /config endpoint regardless of which tab's form sends
them.

server/app/routers/frame_pages.py

@@ -42,7 +42,10 @@ def _frame_page(request: Request, db: Session, frame_id: int, template: str, tab
 
 @router.get("/frames/{frame_id}", response_class=HTMLResponse)
 def frame_photos_page(frame_id: int, request: Request, db: Session = Depends(get_db)):
-    return _frame_page(request, db, frame_id, "frame_photos.html", "photos")
+    return _frame_page(
+        request, db, frame_id, "frame_photos.html", "photos",
+        display_mode_labels=DISPLAY_MODE_LABELS,
+    )
 
 
 def _user_available_calendars(user: User) -> list[dict]:
@@ -122,7 +125,6 @@ def frame_config_page(frame_id: int, request: Request, db: Session = Depends(get
         palette_labels=PALETTE_LABELS,
         default_palette_rgb=DEFAULT_PALETTE_RGB,
         palette_to_hex=palette_to_hex,
-        display_mode_labels=DISPLAY_MODE_LABELS,
     )