Minor: Add Asian Pokemon Card Support (#18)

core/include/ccm/games/pokemonjp/JapanesePokemonSetSource.hpp

@@ -0,0 +1,39 @@
+#pragma once
+
+// JapanesePokemonSetSource: TCGdex ja set list + per-set detail for release
+// dates. English display names come from JapanesePokemonEnCatalog when present.
+
+#include "ccm/games/IGameModule.hpp"
+#include "ccm/games/pokemonjp/JapanesePokemonEnCatalog.hpp"
+#include "ccm/ports/IHttpClient.hpp"
+
+namespace ccm {
+
+class JapanesePokemonSetSource final : public ISetSource {
+public:
+    static constexpr const char* kListEndpoint = "https://api.tcgdex.net/v2/ja/sets";
+
+    JapanesePokemonSetSource(IHttpClient& http, const JapanesePokemonEnCatalog& catalog);
+
+    Result<std::vector<Set>> fetchAll() override;
+
+    void augmentCachedSets(std::vector<Set>& sets) const override;
+
+    // Pure parsers for hermetic tests.
+    static Result<std::vector<Set>> parseListResponse(const std::string& body);
+    static Result<std::string> parseReleaseDate(const std::string& detailBody);
+    static bool shouldExcludeSetId(std::string_view setId) noexcept;
+    static std::string applySetNameOverride(std::string_view setId,
+                                            std::string nameJa);
+    static std::string rewriteReleaseDate(std::string_view isoDate);
+    static std::string buildSetDetailUrl(std::string_view setId);
+
+    // Original-era theme decks / sheets omitted by TCGdex JA. Idempotent by id.
+    static void appendMissingClassicProducts(std::vector<Set>& sets);
+
+private:
+    IHttpClient& http_;
+    const JapanesePokemonEnCatalog& catalog_;
+};
+
+}  // namespace ccm