balance: 回调过度难度——精力消耗4(持续时间翻倍)/恢复8，初始HC170，怪物HP/速度适度降低至合理区间

app/game/page.tsx

@@ -470,7 +470,7 @@ function PuaPanel({ gameReady, hc, waveStarted }: { gameReady: boolean; hc: numb
 // ── 主游戏页面 ────────────────────────────────────────────────────────────────
 export default function GamePage() {
   const gameRef = useRef<{ destroy: (removeCanvas: boolean) => void } | null>(null)
-  const [hc, setHc] = useState(150)
+  const [hc, setHc] = useState(170)
   const [selectedTower, setSelectedTower] = useState<TowerType | null>(null)
   const [gameReady, setGameReady] = useState(false)
   const [waveStarted, setWaveStarted] = useState(false)