Refactor project structure: replace User class with ChatUser, integrate Database class, and update CMake configuration for new files

main.cpp

@@ -1,10 +1,13 @@
+
 #include "config.h"
 #include "server.h"
+#include "database.h"
 
 // main function
 int main(int, char **) {
     auto config = std::make_shared<Yc::Lib::Config>();
-    auto server = std::make_shared<Yc::Lib::Server>(config);
+    auto database = std::make_shared<Yc::Lib::Database>(config);
+    auto server = std::make_shared<Yc::Lib::Server>(config, database);
     server->createRooms(config->group("rooms"));
     server->run();
     return 0;