feat(server): add game reset and end game handling

- Introduced `reset` method in `ServerGameState` to allow game state reinitialization.
- Added `handleEndGame` in `UnoServer` to detect and process game conclusion.

src/game/GameState.cpp

@@ -157,4 +157,19 @@ namespace UNO::GAME {
         this->nextPlayer();
         return cards;
     }
+
+    void ServerGameState::reset()
+    {
+        discardPile_.clear();
+        isReversed_ = false;
+        drawCount_  = 0;
+
+        for (auto &player : players_) {
+            while (!player.isEmpty()) {
+                player.play(*player.getCards().begin());
+            }
+        }
+
+        currentPlayer_ = players_.begin();
+    }
 }   // namespace UNO::GAME

src/game/GameState.h

@@ -359,6 +359,11 @@ namespace UNO::GAME {
          * 由于用户摸牌而改变状态
          */
         std::vector<Card> updateStateByDraw() override;
+
+        /**
+         * 重置游戏状态（用于重新开始）
+         */
+        void reset();
     };
 }   // namespace UNO::GAME
 

src/server/UnoServer.cpp

@@ -90,11 +90,41 @@ namespace UNO::SERVER {
     void UnoServer::handlePlayCard(size_t playerId, GAME::Card card)
     {
         this->serverGameState_.updateStateByCard(card);
+
+        // 检查是否有玩家获胜（手牌为空）
+        bool gameEnded = false;
+        for (const auto &player : this->serverGameState_.getPlayers()) {
+            if (player.isEmpty()) {
+                gameEnded = true;
+                break;
+            }
+        }
+
         NETWORK::PlayCardPayload payload = {card};
         auto message = NETWORK::MessageSerializer::serialize({NETWORK::MessageStatus::OK, NETWORK::MessagePayloadType::PLAY_CARD, payload});
         for (size_t i = 0; i < playerCount; i++) {
             this->networkServer_.send(gameIdToNetworkId.at(i), message);
         }
+
+        if (gameEnded) {
+            this->handleEndGame();
+        }
+    }
+
+    void UnoServer::handleEndGame()
+    {
+        NETWORK::EndGamePayload payload{};
+        auto message = NETWORK::MessageSerializer::serialize({NETWORK::MessageStatus::OK, NETWORK::MessagePayloadType::END_GAME, payload});
+
+        for (size_t i = 0; i < playerCount; i++) {
+            this->networkServer_.send(gameIdToNetworkId.at(i), message);
+        }
+
+        this->serverGameState_.reset();
+
+        for (size_t i = 0; i < playerCount; i++) {
+            this->isReadyToStart[i] = false;
+        }
     }
 
     void UnoServer::run()

src/server/UnoServer.h

@@ -46,6 +46,11 @@ namespace UNO::SERVER {
          */
         void handlePlayCard(size_t playerId, GAME::Card card);
 
+        /**
+         * 处理游戏结束事件
+         */
+        void handleEndGame();
+
     public:
         explicit UnoServer(uint16_t port = 10001);