feat: 实现麻将游戏结算系统与自摸胡功能

新增结算类型枚举和分数变更记录模型
补全响应裁决器与结算服务，支持点炮胡、自摸胡和明杠结算
扩展座位模型，增加已胡状态和分数字段
完善胡牌评估器，支持自摸胡判断
前端原型页增加分数显示和已胡状态
更新SPRINT文档记录当前进度

frontend/src/App.vue

@@ -30,7 +30,9 @@ type SelfSeatView = {
   seatNo: number
   playerId: string
   nickname: string
+  won: boolean
   lackSuit: string | null
+  score: number
   handTiles: string[]
   discardTiles: string[]
 }
@@ -40,7 +42,9 @@ type PublicSeatView = {
   playerId: string
   nickname: string
   ai: boolean
+  won: boolean
   lackSuit: string | null
+  score: number
   handCount: number
   discardTiles: string[]
 }
@@ -125,7 +129,11 @@ const actionScopeLabelMap: Record<string, string> = {
 
 const canSelectLack = computed(() => game.value?.phase === 'LACK_SELECTION')
 const canDiscard = computed(
-  () => game.value?.phase === 'PLAYING' && game.value.selfSeat.playerId === currentUserId.value && game.value.currentSeatNo === game.value.selfSeat.seatNo
+  () =>
+    game.value?.phase === 'PLAYING' &&
+    !game.value.selfSeat.won &&
+    game.value.selfSeat.playerId === currentUserId.value &&
+    game.value.currentSeatNo === game.value.selfSeat.seatNo
 )
 const publicSeats = computed(() => game.value?.seats ?? [])
 const privateActionCandidates = computed(() => privateAction.value?.candidates ?? [])
@@ -330,7 +338,7 @@ async function refreshGameState() {
   })
 }
 
-async function submitAction(actionType: string, tile?: string) {
+async function submitAction(actionType: string, tile?: string, sourceSeatNo?: number | null) {
   if (!game.value) {
     return
   }
@@ -341,7 +349,8 @@ async function submitAction(actionType: string, tile?: string) {
       body: JSON.stringify({
         userId: currentUserId.value,
         actionType,
-        tile: tile ?? null
+        tile: tile ?? null,
+        sourceSeatNo: sourceSeatNo ?? null
       })
     })
     info.value = actionType === 'DISCARD' ? `已打出 ${tile}。` : `已提交动作 ${actionType}。`
@@ -355,6 +364,11 @@ function selectLack() {
 function discard(tile: string) {
   return submitAction('DISCARD', tile)
 }
+
+function submitCandidateAction(actionType: string, tile: string | null) {
+  const sourceSeatNo = privateAction.value?.sourceSeatNo ?? null
+  return submitAction(actionType, tile ?? undefined, sourceSeatNo)
+}
 </script>
 
 <template>
@@ -512,7 +526,11 @@ function discard(tile: string) {
         <div class="self-card">
           <div class="section-title">
             <strong>我的手牌</strong>
-            <span class="mini-pill">当前回合 {{ game.currentSeatNo }}</span>
+            <div class="mini-tags">
+              <span class="mini-pill">当前回合 {{ game.currentSeatNo }}</span>
+              <span class="mini-tag">积分 {{ game.selfSeat.score }}</span>
+              <span class="mini-tag">{{ game.selfSeat.won ? '已胡' : '未胡' }}</span>
+            </div>
           </div>
           <div class="tile-grid">
             <button
@@ -549,13 +567,15 @@ function discard(tile: string) {
                 <span v-if="privateAction.sourceSeatNo !== null" class="mini-tag">来源座位 {{ privateAction.sourceSeatNo }}</span>
               </div>
               <div class="candidate-list" v-if="privateActionCandidates.length > 0">
-                <span
+                <button
                   v-for="(candidate, index) in privateActionCandidates"
                   :key="`${candidate.actionType}-${candidate.tile ?? 'none'}-${index}`"
                   class="candidate-chip"
+                  type="button"
+                  @click="submitCandidateAction(candidate.actionType, candidate.tile)"
                 >
                   {{ candidate.actionType }}<template v-if="candidate.tile"> · {{ candidate.tile }}</template>
-                </span>
+                </button>
               </div>
               <span v-if="privateAction.actionScope === 'RESPONSE'" class="message-copy">
                 当前原型页已能识别响应候选消息，后续会继续补正式动作面板和真实响应流程。
@@ -579,6 +599,8 @@ function discard(tile: string) {
             </div>
             <div class="mini-tags">
               <span class="mini-tag">{{ seat.ai ? 'AI' : '真人' }}</span>
+              <span class="mini-tag">{{ seat.won ? '已胡' : '在局' }}</span>
+              <span class="mini-tag">积分 {{ seat.score }}</span>
               <span class="mini-tag">手牌 {{ seat.handCount }}</span>
               <span class="mini-tag">{{ seat.lackSuit ?? '未定缺' }}</span>
             </div>