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

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

database/migrations/065_website_static_image_page_key.sql

@@ -0,0 +1,7 @@
+-- Group static image slots by website page (home, products, about, …)
+
+ALTER TABLE website_image_slots
+  ADD COLUMN IF NOT EXISTS page_key VARCHAR(100) NOT NULL DEFAULT 'home';
+
+CREATE INDEX IF NOT EXISTS idx_website_image_slots_business_id_page_key
+  ON website_image_slots (business_id, page_key);