Add ACMCC app source, Supabase backend, and project config

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

supabase/migrations/20260320000912_dda598a1-04b8-4f8a-9924-24e0ab74b91a.sql

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+ALTER TABLE public.bill_approvals
+ADD COLUMN IF NOT EXISTS bill_id UUID;
+
+DO $$
+BEGIN
+  IF NOT EXISTS (
+    SELECT 1
+    FROM information_schema.table_constraints
+    WHERE constraint_schema = 'public'
+      AND table_name = 'bill_approvals'
+      AND constraint_name = 'bill_approvals_bill_id_fkey'
+  ) THEN
+    ALTER TABLE public.bill_approvals
+    ADD CONSTRAINT bill_approvals_bill_id_fkey
+    FOREIGN KEY (bill_id)
+    REFERENCES public.bills(id)
+    ON DELETE CASCADE;
+  END IF;
+END $$;
+
+CREATE INDEX IF NOT EXISTS idx_bill_approvals_bill_id
+ON public.bill_approvals (bill_id);