minor: New Game Digimon Digi-Battle (#17)

* digimon digi battle added to supported games

* sonarqube update

* readme update

---------

Co-authored-by: sdine <sdine@sdine.com>

core/include/ccm/games/digibattle99/DigiBattle99SetSource.hpp

@@ -0,0 +1,37 @@
+#pragma once
+
+// DigiBattle99SetSource: ISetSource for Digimon Digi-Battle (1999 English).
+// digimoncard.io has no dedicated sets endpoint; we derive unique pack names
+// from a bulk search.php call scoped to series=Digimon Digi-Battle Card Game.
+
+#include "ccm/games/IGameModule.hpp"
+#include "ccm/ports/IHttpClient.hpp"
+
+#include <string>
+#include <string_view>
+
+namespace ccm {
+
+class DigiBattle99SetSource final : public ISetSource {
+public:
+    static constexpr const char* kEndpoint =
+        "https://digimoncard.io/api-public/search.php?"
+        "series=Digimon%20Digi-Battle%20Card%20Game&limit=1000&sort=name&sortdirection=asc";
+
+    static constexpr const char* kSeries = "Digimon Digi-Battle Card Game";
+
+    explicit DigiBattle99SetSource(IHttpClient& http);
+
+    Result<std::vector<Set>> fetchAll() override;
+
+    // Pure parser exposed for unit testing without a network round-trip.
+    static Result<std::vector<Set>> parseResponse(const std::string& body);
+
+    // Stable Set.id from a pack display name (ASCII lower, non-alnum -> '-').
+    static std::string slugifyPackName(std::string_view packName);
+
+private:
+    IHttpClient& http_;
+};
+
+}  // namespace ccm