added full gifts support

deploy/migrations/20260807120001_gif_catalog.up.sql

@@ -0,0 +1,17 @@
+-- Admin-curated GIF catalog: what @gif (see 20260807120000) serves as inline
+-- results for the client's GIF picker. document_id/document_ids are loose
+-- bigint references (no FK), matching every other media table in this schema
+-- (e.g. sticker_sets.thumb_document_id) -- documents are immutable once
+-- created, so there is nothing to cascade.
+CREATE TABLE public.gif_catalog (
+    id bigint PRIMARY KEY,
+    title text DEFAULT ''::text NOT NULL,
+    document_id bigint NOT NULL,
+    enabled boolean DEFAULT true NOT NULL,
+    sort_order integer DEFAULT 0 NOT NULL,
+    created_by text DEFAULT ''::text NOT NULL,
+    created_at timestamp with time zone DEFAULT now() NOT NULL,
+    updated_at timestamp with time zone DEFAULT now() NOT NULL
+);
+
+CREATE INDEX gif_catalog_enabled_sort_idx ON public.gif_catalog (enabled, sort_order, id);