feat(pua): 新增重复检测——LLM语义相似度判断，相似60%效果降级，相似80%强制翻车，额外扣HC惩罚

app/game/page.tsx

@@ -21,7 +21,11 @@ interface PuaResult {
   title: string
   desc: string
   effect: EffectType
-  cost?: number   // 实际扣除的 HC（前端填写）
+  cost?: number
+  similarity?: number
+  similarTo?: string
+  isDuplicate?: boolean
+  penaltyMultiplier?: number
 }
 
 const EFFECT_META: Record<EffectType, { label: string; color: string; icon: string }> = {
@@ -53,7 +57,10 @@ function PuaPanel({ gameReady, hc, waveStarted }: { gameReady: boolean; hc: numb
   const [loading, setLoading] = useState(false)
   const [result, setResult] = useState<PuaResult | null>(null)
   const [history, setHistory] = useState<PuaResult[]>([])
+  // 历史原文列表（用于发给服务端做相似度检测）
+  const historyTexts = useRef<string[]>([])
   const [insufficient, setInsufficient] = useState(false)
+  const [dupWarning, setDupWarning] = useState<string | null>(null)
   const textareaRef = useRef<HTMLTextAreaElement>(null)
   const placeholder = useRef(PUA_PLACEHOLDERS[Math.floor(Math.random() * PUA_PLACEHOLDERS.length)]).current
 
@@ -63,7 +70,6 @@ function PuaPanel({ gameReady, hc, waveStarted }: { gameReady: boolean; hc: numb
   const handleSubmit = useCallback(async () => {
     if (!text.trim() || loading || !gameReady || !waveStarted) return
 
-    // 先从游戏扣除 HC（扣不到则拒绝）
     const spendHC: ((n: number) => boolean) | undefined =
       typeof window !== 'undefined' ? (window as any).__gameSpendHC : undefined
 
@@ -74,6 +80,7 @@ function PuaPanel({ gameReady, hc, waveStarted }: { gameReady: boolean; hc: numb
 
     const actualCost = calcPuaCost(currentHC)
 
+    // 扣除基础费用
     if (!spendHC?.(actualCost)) {
       setInsufficient(true)
       setTimeout(() => setInsufficient(false), 2000)
@@ -82,18 +89,43 @@ function PuaPanel({ gameReady, hc, waveStarted }: { gameReady: boolean; hc: numb
 
     setLoading(true)
     setResult(null)
+    setDupWarning(null)
     setInsufficient(false)
+
     try {
       const res = await fetch('/api/pua-score', {
         method: 'POST',
         headers: { 'Content-Type': 'application/json' },
-        body: JSON.stringify({ text: text.trim() }),
+        body: JSON.stringify({
+          text: text.trim(),
+          history: historyTexts.current,
+        }),
       })
-      const data: PuaResult & { cost?: number } = await res.json()
+      const data: PuaResult = await res.json()
       data.cost = actualCost
+
+      // 处理重复惩罚：额外扣 HC
+      const penalty = data.penaltyMultiplier ?? 0
+      if (penalty > 0 && data.isDuplicate) {
+        const extraCost = Math.round(actualCost * penalty)
+        const penaltyPaid = spendHC?.(extraCost) ?? false
+        if (penaltyPaid) {
+          data.cost = actualCost + extraCost
+          // 显示重复警告
+          const sim = data.similarity ?? 0
+          const level = sim >= 0.8 ? '严重重复' : '内容相似'
+          setDupWarning(
+            `检测到${level}！额外扣除 ${extraCost} HC` +
+            (data.similarTo ? `\n（与"${data.similarTo}"相似）` : '')
+          )
+        }
+      }
+
       setResult(data)
+      // 更新历史原文列表（最近8条）
+      historyTexts.current = [text.trim(), ...historyTexts.current].slice(0, 8)
       setHistory(prev => [data, ...prev].slice(0, 5))
-      // 通知游戏场景应用 buff
+
       if (typeof window !== 'undefined') {
         ;(window as any).__gamePuaBuff?.(data.effect, data.score, data.title)
       }
@@ -183,7 +215,7 @@ function PuaPanel({ gameReady, hc, waveStarted }: { gameReady: boolean; hc: numb
         </div>
       </div>
 
-      {/* HC 不足闪烁提示 */}
+      {/* HC 不足提示 */}
       {insufficient && (
         <div style={{
           backgroundColor: '#7F1D1D',
@@ -194,12 +226,28 @@ function PuaPanel({ gameReady, hc, waveStarted }: { gameReady: boolean; hc: numb
           fontSize: '14px',
           color: '#FCA5A5',
           textAlign: 'center',
-          animation: 'none',
         }}>
           HC 不足！先去打怪赚钱！
         </div>
       )}
 
+      {/* 重复惩罚警告 */}
+      {dupWarning && (
+        <div style={{
+          backgroundColor: '#431407',
+          border: '1px solid #F97316',
+          borderRadius: '6px',
+          padding: '7px 8px',
+          fontFamily: 'VT323, monospace',
+          fontSize: '13px',
+          color: '#FED7AA',
+          lineHeight: 1.4,
+          whiteSpace: 'pre-line',
+        }}>
+          {dupWarning}
+        </div>
+      )}
+
       {/* 输入框 */}
       <textarea
         ref={textareaRef}
@@ -295,6 +343,35 @@ function PuaPanel({ gameReady, hc, waveStarted }: { gameReady: boolean; hc: numb
             }}>
               {result.desc}
             </div>
+            {/* 相似度指示（有重复时显示） */}
+            {(result.similarity ?? 0) >= 0.3 && (
+              <div style={{
+                backgroundColor: '#431407',
+                border: '1px solid #F97316',
+                borderRadius: '4px',
+                padding: '4px 6px',
+                fontFamily: 'VT323, monospace',
+                fontSize: '12px',
+                color: '#FED7AA',
+              }}>
+                <div style={{ display: 'flex', justifyContent: 'space-between', marginBottom: '3px' }}>
+                  <span>重复检测</span>
+                  <span style={{ color: (result.similarity ?? 0) >= 0.8 ? '#EF4444' : '#F97316' }}>
+                    {Math.round((result.similarity ?? 0) * 100)}%
+                  </span>
+                </div>
+                {/* 相似度进度条 */}
+                <div style={{ height: '3px', backgroundColor: '#1c0a04', borderRadius: '2px' }}>
+                  <div style={{
+                    height: '100%',
+                    width: `${(result.similarity ?? 0) * 100}%`,
+                    backgroundColor: (result.similarity ?? 0) >= 0.8 ? '#EF4444' : '#F97316',
+                    borderRadius: '2px',
+                    transition: 'width 0.3s ease',
+                  }} />
+                </div>
+              </div>
+            )}
             {/* 效果标签 + 花费 */}
             <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
               <div style={{
@@ -376,13 +453,15 @@ function PuaPanel({ gameReady, hc, waveStarted }: { gameReady: boolean; hc: numb
         paddingTop: '8px',
       }}>
         <span style={{ color: '#475569' }}>费用 = 当前HC × 15%</span><br />
-        <span style={{ color: '#334155' }}>越富越贵，最低20 最高200</span><br />
         ──────────<br />
-        Enter 快速提交<br />
-        1-2分: 废话翻车<br />
-        4-6分: 攻击+HC<br />
+        相似60%: 效果降级<br />
+        相似80%: 强制翻车<br />
+        重复均额外扣HC<br />
+        ──────────<br />
+        9-10分: 全场狂暴<br />
         7-8分: 攻速暴增<br />
-        9-10分: 全场狂暴
+        4-6分: 攻击+HC<br />
+        1-2分: 废话翻车
       </div>
     </div>
   )