feat(game): 添加局间结算界面，对接后端settlement状态

- GameState新增currentRound/totalRounds字段
- 解析后端返回的current_round和total_rounds
- 新增结算弹窗：展示每位玩家得分、胡牌标记和排名
- 状态面板显示当前局数信息
- 新增next_round动作，结算后点击"下一局"继续游戏
- 最后一局结算后显示"返回大厅"按钮

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/views/ChengduGamePage.vue

@@ -97,6 +97,7 @@ const dingQuePending = ref(false)
 const discardPending = ref(false)
 const claimActionPending = ref(false)
 const turnActionPending = ref(false)
+const nextRoundPending = ref(false)
 const selectedDiscardTileId = ref<number | null>(null)
 let clockTimer: number | null = null
 let discardPendingTimer: number | null = null
@@ -322,6 +323,35 @@ const roomStatusText = computed(() => {
   return map[status] ?? status ?? '--'
 })
 
+const roundText = computed(() => {
+  if (gameStore.totalRounds > 0) {
+    return `${gameStore.currentRound}/${gameStore.totalRounds}`
+  }
+  return ''
+})
+
+const showSettlementOverlay = computed(() => {
+  return gameStore.phase === 'settlement'
+})
+
+const isLastRound = computed(() => {
+  return gameStore.currentRound >= gameStore.totalRounds && gameStore.totalRounds > 0
+})
+
+const settlementPlayers = computed(() => {
+  const players = Object.values(gameStore.players)
+  const winnerSet = new Set(gameStore.winners)
+  return players
+      .map((player) => ({
+        playerId: player.playerId,
+        displayName: player.displayName || `玩家${player.seatIndex + 1}`,
+        score: gameStore.scores[player.playerId] ?? 0,
+        isWinner: winnerSet.has(player.playerId),
+        seatIndex: player.seatIndex,
+      }))
+      .sort((a, b) => b.score - a.score)
+})
+
 const myReadyState = computed(() => {
   return Boolean(myPlayer.value?.isReady)
 })
@@ -1203,6 +1233,14 @@ function handleRoomStateResponse(message: unknown): void {
     ) as Record<string, number>
   }
   gameStore.winners = readStringArray(payload, 'winners')
+  const currentRound = readNumber(payload, 'current_round', 'currentRound')
+  const totalRounds = readNumber(payload, 'total_rounds', 'totalRounds')
+  if (typeof currentRound === 'number') {
+    gameStore.currentRound = currentRound
+  }
+  if (typeof totalRounds === 'number') {
+    gameStore.totalRounds = totalRounds
+  }
   gameStore.pendingClaim = normalizePendingClaim(payload)
   if (!gameStore.pendingClaim) {
     claimActionPending.value = false
@@ -1255,6 +1293,9 @@ function handleRoomStateResponse(message: unknown): void {
   if (phase !== 'waiting') {
     startGamePending.value = false
   }
+  if (phase !== 'settlement') {
+    nextRoundPending.value = false
+  }
   if (currentTurnPlayerId && currentTurnPlayerId !== loggedInUserId.value) {
     markDiscardCompleted()
   }
@@ -1534,6 +1575,14 @@ function handleRoomInfoResponse(message: unknown): void {
     ) as Record<string, number>
   }
   gameStore.winners = readStringArray(gameState ?? {}, 'winners')
+  const infoCurrentRound = readNumber(gameState ?? {}, 'current_round', 'currentRound')
+  const infoTotalRounds = readNumber(gameState ?? {}, 'total_rounds', 'totalRounds')
+  if (typeof infoCurrentRound === 'number') {
+    gameStore.currentRound = infoCurrentRound
+  }
+  if (typeof infoTotalRounds === 'number') {
+    gameStore.totalRounds = infoTotalRounds
+  }
 
   setActiveRoom({
     roomId,
@@ -2465,6 +2514,19 @@ function startGame(): void {
   })
 }
 
+function nextRound(): void {
+  if (nextRoundPending.value) {
+    return
+  }
+
+  nextRoundPending.value = true
+  sendWsMessage({
+    type: 'next_round',
+    roomId: gameStore.roomId,
+    payload: {},
+  })
+}
+
 function chooseDingQue(suit: Tile['suit']): void {
   if (dingQuePending.value || !showDingQueChooser.value) {
     return
@@ -2887,6 +2949,10 @@ onBeforeUnmount(() => {
                 <span>人数</span>
                 <strong>{{ roomState.playerCount }}/{{ roomState.maxPlayers }}</strong>
               </div>
+              <div v-if="roundText" class="room-status-item">
+                <span>局数</span>
+                <strong>{{ roundText }}</strong>
+              </div>
               <div class="room-status-item">
                 <span>状态</span>
                 <strong>{{ roomStatusText }}</strong>
@@ -3062,6 +3128,52 @@ onBeforeUnmount(() => {
             <span>等待房主开始游戏</span>
           </div>
 
+          <div v-if="showSettlementOverlay" class="settlement-overlay">
+            <div class="settlement-panel">
+              <h2 class="settlement-title">
+                {{ isLastRound ? '最终结算' : `第 ${gameStore.currentRound} 局结算` }}
+              </h2>
+              <p v-if="gameStore.totalRounds > 0" class="settlement-round-info">
+                {{ gameStore.currentRound }} / {{ gameStore.totalRounds }} 局
+              </p>
+              <div class="settlement-list">
+                <div
+                    v-for="(item, index) in settlementPlayers"
+                    :key="item.playerId"
+                    class="settlement-row"
+                    :class="{ 'is-winner': item.isWinner, 'is-self': item.playerId === loggedInUserId }"
+                >
+                  <span class="settlement-rank">{{ index + 1 }}</span>
+                  <span class="settlement-name">
+                    {{ item.displayName }}
+                    <span v-if="item.isWinner" class="settlement-winner-badge">胡</span>
+                  </span>
+                  <span class="settlement-score" :class="{ 'is-positive': item.score > 0, 'is-negative': item.score < 0 }">
+                    {{ item.score > 0 ? '+' : '' }}{{ item.score }}
+                  </span>
+                </div>
+              </div>
+              <div class="settlement-actions">
+                <button
+                    v-if="!isLastRound"
+                    class="ready-toggle ready-toggle-inline settlement-btn"
+                    type="button"
+                    :disabled="nextRoundPending"
+                    @click="nextRound"
+                >
+                  <span class="ready-toggle-label">{{ nextRoundPending ? '准备中...' : '下一局' }}</span>
+                </button>
+                <button
+                    v-else
+                    class="ready-toggle ready-toggle-inline settlement-btn"
+                    type="button"
+                    @click="backHall"
+                >
+                  <span class="ready-toggle-label">返回大厅</span>
+                </button>
+              </div>
+            </div>
+          </div>
 
           <div class="bottom-control-panel">
             <div v-if="showDingQueChooser || showReadyToggle || showStartGameButton || selectedDiscardTile" class="bottom-action-bar">