Refactor chat room implementation

- Renamed Room class to ChatRoom and updated all references accordingly.
- Removed the old room.cpp and room.h files.
- Updated CMakeLists.txt to include chat_room.cpp instead of room.cpp.
- Modified ChatUser class to use shared_ptr<ChatRoom> instead of shared_ptr<Room>.
- Updated Server class to create instances of ChatRoom instead of Room.
- Removed User class and its associated files, integrating its functionality into ChatUser.
- Ensured all relevant includes and dependencies are updated to reflect the new class structure.

server.h

@@ -4,7 +4,7 @@
 #include "config.h"
 #include "database.h"
 #include <vector>
-#include "room.h"
+#include "chat_room.h"
 #include "base.h"
 #include <json/value.h>
 
@@ -24,7 +24,7 @@ namespace Yc {
             std::shared_ptr<Yc::Lib::Config> _config;
             std::shared_ptr<Yc::Lib::Database> _database;
             bool _stop;
-            std::vector<std::shared_ptr<Yc::Lib::Room>> _rooms;
+            std::vector<std::shared_ptr<Yc::Lib::ChatRoom>> _rooms;
             void createRooms(Json::Value roomList);
         private:
             void handleRequest();