Add phần create map by upload

src/storage/site_store.hpp

@@ -0,0 +1,30 @@
+#pragma once
+
+#include <nlohmann/json.hpp>
+
+#include <mutex>
+#include <optional>
+#include <string>
+
+namespace lm {
+
+class Database;
+
+class SiteStore
+{
+public:
+  explicit SiteStore(Database& db);
+
+  nlohmann::json list() const;
+  std::optional<nlohmann::json> find(const std::string& id) const;
+  std::optional<nlohmann::json> create(const nlohmann::json& payload, std::string& err);
+  bool update(const std::string& id, const nlohmann::json& payload, std::string& err);
+  bool remove(const std::string& id, std::string& err);
+  std::string ensureDefaultSiteId();
+
+private:
+  Database& db_;
+  mutable std::mutex mu_;
+};
+
+}  // namespace lm