Add ACMCC app source, Supabase backend, and project config

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

supabase/migrations/20260318165521_36e2a189-5df4-4511-a864-f0bd63d14c6f.sql

@@ -0,0 +1,17 @@
+
+CREATE TABLE public.bill_comments (
+  id UUID NOT NULL DEFAULT gen_random_uuid() PRIMARY KEY,
+  bill_id UUID NOT NULL REFERENCES public.bills(id) ON DELETE CASCADE,
+  user_id UUID NOT NULL,
+  user_name TEXT NOT NULL DEFAULT '',
+  comment TEXT NOT NULL,
+  created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT now()
+);
+
+ALTER TABLE public.bill_comments ENABLE ROW LEVEL SECURITY;
+
+CREATE POLICY "Authenticated users can read bill comments"
+  ON public.bill_comments FOR SELECT TO authenticated USING (true);
+
+CREATE POLICY "Authenticated users can insert bill comments"
+  ON public.bill_comments FOR INSERT TO authenticated WITH CHECK (true);