Add ACMCC app source, Supabase backend, and project config

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

supabase/migrations/20260317224247_2bf55ff2-b4a4-43f1-8445-ffa7b2993451.sql

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+-- Allow any authenticated user to insert their own comments
+CREATE POLICY "Authenticated users can insert own entity_comments"
+ON public.entity_comments
+FOR INSERT
+TO authenticated
+WITH CHECK (auth.uid() = user_id);
+
+-- Allow any authenticated user to insert their own votes
+CREATE POLICY "Authenticated users can insert own entity_votes"
+ON public.entity_votes
+FOR INSERT
+TO authenticated
+WITH CHECK (auth.uid() = user_id);
+
+-- Allow any authenticated user to update their own votes
+CREATE POLICY "Authenticated users can update own entity_votes"
+ON public.entity_votes
+FOR UPDATE
+TO authenticated
+USING (auth.uid() = user_id)
+WITH CHECK (auth.uid() = user_id);
+
+-- Allow any authenticated user to delete their own votes
+CREATE POLICY "Authenticated users can delete own entity_votes"
+ON public.entity_votes
+FOR DELETE
+TO authenticated
+USING (auth.uid() = user_id);
+
+-- Allow any authenticated user to delete their own comments
+CREATE POLICY "Authenticated users can delete own entity_comments"
+ON public.entity_comments
+FOR DELETE
+TO authenticated
+USING (auth.uid() = user_id);
+
+-- Enable realtime for both tables
+ALTER PUBLICATION supabase_realtime ADD TABLE public.entity_votes;
+ALTER PUBLICATION supabase_realtime ADD TABLE public.entity_comments;