Initial commit: PastPaper Master full stack

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/lib/supabase.ts

@@ -0,0 +1,6 @@
+import { createClient } from "@supabase/supabase-js";
+
+const supabaseUrl = import.meta.env.VITE_SUPABASE_URL as string;
+const supabaseAnonKey = import.meta.env.VITE_SUPABASE_ANON_KEY as string;
+
+export const supabase = createClient(supabaseUrl, supabaseAnonKey);