Add ACMCC app source, Supabase backend, and project config

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

supabase/migrations/20260507164105_c0fb6a02-1da2-4097-972b-343933933cec.sql

@@ -0,0 +1,21 @@
+CREATE OR REPLACE FUNCTION public.get_association_payment_gateways(p_association_id uuid)
+RETURNS jsonb
+LANGUAGE sql
+STABLE SECURITY DEFINER
+SET search_path TO 'public'
+AS $function$
+  SELECT jsonb_build_object(
+    'stripe', (
+      SELECT jsonb_build_object(
+        'id', id, 'association_id', association_id,
+        'stripe_account_id', stripe_account_id,
+        'stripe_public_key', stripe_public_key,
+        'is_active', is_active, 'label', label,
+        'pass_processing_fee', pass_processing_fee,
+        'processing_fee_percent', processing_fee_percent,
+        'processing_fee_fixed_cents', processing_fee_fixed_cents
+      ) FROM public.stripe_account_mappings
+      WHERE association_id = p_association_id AND is_active = true LIMIT 1
+    )
+  );
+$function$;