supabase integration instead firebase

src/network/supabase_client.h

@@ -0,0 +1,14 @@
+#pragma once
+#include <string>
+#include <vector>
+#include "../persistence/Scores.h"
+
+namespace supabase {
+
+// Submit a highscore asynchronously (detached thread)
+void SubmitHighscoreAsync(const ScoreEntry &entry);
+
+// Fetch highscores for a game type. If gameType is empty, fetch all (limited).
+std::vector<ScoreEntry> FetchHighscores(const std::string &gameType, int limit);
+
+} // namespace supabase