Add ACMCC app source, Supabase backend, and project config

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

supabase/migrations/20260317171914_1afc0bec-7841-411f-93d5-6562f7304cb4.sql

@@ -0,0 +1,29 @@
+
+-- Store validation proof records for forms & letters
+CREATE TABLE public.document_validation_proofs (
+  id UUID NOT NULL DEFAULT gen_random_uuid() PRIMARY KEY,
+  document_type TEXT NOT NULL,
+  document_title TEXT,
+  generated_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT now(),
+  generated_by UUID,
+  association_id UUID REFERENCES public.associations(id),
+  metadata JSONB DEFAULT '{}',
+  verification_hash TEXT NOT NULL,
+  created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT now()
+);
+
+ALTER TABLE public.document_validation_proofs ENABLE ROW LEVEL SECURITY;
+
+CREATE POLICY "Staff full access on document_validation_proofs"
+ON public.document_validation_proofs
+FOR ALL
+TO authenticated
+USING (public.has_role(auth.uid(), 'admin'::app_role) OR public.has_role(auth.uid(), 'manager'::app_role))
+WITH CHECK (public.has_role(auth.uid(), 'admin'::app_role) OR public.has_role(auth.uid(), 'manager'::app_role));
+
+-- Anyone can verify a proof by ID (public read for verification)
+CREATE POLICY "Anyone can verify proofs"
+ON public.document_validation_proofs
+FOR SELECT
+TO authenticated
+USING (true);