Add ACMCC app source, Supabase backend, and project config

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

supabase/migrations/20260502165358_d9f18f05-4404-457c-942b-f2eaf92668bd.sql

@@ -0,0 +1,20 @@
+
+-- Allow ARC applications in the Buildium import staging table
+ALTER TABLE public.buildium_import_staging
+  DROP CONSTRAINT IF EXISTS buildium_import_staging_kind_check;
+
+ALTER TABLE public.buildium_import_staging
+  ADD CONSTRAINT buildium_import_staging_kind_check
+  CHECK (kind = ANY (ARRAY['unit'::text, 'owner'::text, 'gl_account'::text, 'ledger_entry'::text, 'arc_application'::text]));
+
+-- Track the originating Buildium request id on ARC applications so re-imports update in place
+ALTER TABLE public.arc_applications
+  ADD COLUMN IF NOT EXISTS buildium_arc_request_id text;
+
+CREATE UNIQUE INDEX IF NOT EXISTS uniq_arc_apps_assoc_buildium_id
+  ON public.arc_applications(association_id, buildium_arc_request_id)
+  WHERE buildium_arc_request_id IS NOT NULL;
+
+-- Allow staff service role / system to insert seeded comments where user_id is null (Buildium-imported decision notes)
+ALTER TABLE public.arc_application_comments
+  ALTER COLUMN user_id DROP NOT NULL;