Add website static image slots with page grouping and bilingual captions.

Co-authored-by: Cursor <cursoragent@cursor.com>

database/migrations/064_website_static_image_item_count.sql

@@ -0,0 +1,19 @@
+-- Fixed slot count: NULL = unlimited list; 1 for single; N for a row of N uploaders
+
+ALTER TABLE website_image_slots
+  ADD COLUMN IF NOT EXISTS item_count INTEGER;
+
+ALTER TABLE website_image_slots
+  DROP CONSTRAINT IF EXISTS website_image_slots_item_count_check;
+
+ALTER TABLE website_image_slots
+  ADD CONSTRAINT website_image_slots_item_count_check
+  CHECK (item_count IS NULL OR item_count >= 1);
+
+UPDATE website_image_slots
+SET item_count = 1
+WHERE kind = 'single' AND item_count IS NULL;
+
+UPDATE website_image_slots
+SET item_count = 2
+WHERE slot_key = 'two-banner-row' AND kind = 'list';