feat: upload creativos, PMax formats, portada IG/FB y seguimiento con notas

Permite subir media sin URL; previews Google PMax por ratio; calendario anual estilo Miia con filtros IG/FB y LinkedIn; seguimiento con selector de fechas, KPIs y cuadro de notas.

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

sql/creatives_upload_pmax.sql

@@ -0,0 +1,35 @@
+-- Expand creatives.format for Google Performance Max asset ratios + upload fields
+-- Idempotent.
+
+alter table public.creatives drop constraint if exists creatives_format_check;
+
+alter table public.creatives
+  add constraint creatives_format_check
+  check (
+    format is null
+    or format in (
+      'image',
+      'video',
+      'carousel',
+      'reel',
+      'story',
+      'rsa',
+      'pmax',
+      'pmax_landscape',
+      'pmax_square',
+      'pmax_portrait',
+      'pmax_vertical',
+      'pmax_logo',
+      'youtube',
+      'other'
+    )
+  );
+
+alter table public.creatives
+  add column if not exists storage_path text;
+
+alter table public.creatives
+  add column if not exists mime_type text;
+
+comment on column public.creatives.storage_path is
+  'Path in tenant-assets bucket for uploaded creative media';