balance: 全面提升游戏难度——怪物HP/速度/KPI扣减上调，精力消耗加快，初始HC降至150，波次加量缩间隔，Boss技能冷却12s，自动下一波等待2s

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(200)
+  const [hc, setHc] = useState(150)
   const [selectedTower, setSelectedTower] = useState<TowerType | null>(null)
   const [gameReady, setGameReady] = useState(false)
   const [waveStarted, setWaveStarted] = useState(false)