Add ACMCC app source, Supabase backend, and project config

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

supabase/migrations/20260328201846_3a620941-b4cc-44a5-bc36-65ad411ecdc9.sql

@@ -0,0 +1,9 @@
+UPDATE public.status_updates
+SET created_by = NULL
+WHERE created_by IS NOT NULL
+  AND created_by NOT IN (SELECT user_id FROM public.profiles);
+
+ALTER TABLE public.status_updates
+  ADD CONSTRAINT status_updates_created_by_fkey
+  FOREIGN KEY (created_by) REFERENCES public.profiles(user_id)
+  ON DELETE SET NULL;