Add ACMCC app source, Supabase backend, and project config

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

supabase/migrations/20260512012001_1a5cadcd-1609-47b1-b398-5287d83f3d6a.sql

@@ -0,0 +1,19 @@
+CREATE OR REPLACE FUNCTION public.prevent_updates_on_finalized_arc()
+RETURNS trigger
+LANGUAGE plpgsql
+SECURITY DEFINER
+SET search_path = public
+AS $$
+BEGIN
+  IF lower(COALESCE(OLD.status,'')) IN ('approved','denied') THEN
+    IF public.has_role(auth.uid(), 'admin'::public.app_role) THEN
+      RETURN NEW;
+    END IF;
+
+    RAISE EXCEPTION 'This ARC application has been finalized (approved or denied) and is locked from further changes.'
+      USING ERRCODE = 'check_violation';
+  END IF;
+
+  RETURN NEW;
+END;
+$$;