feat(game): PUA激励台增加HC消耗机制，费用=当前HC×15%，余额不足时禁用，防止无限激励破坏平衡

game/GameScene.ts

@@ -124,13 +124,19 @@ export function createGameScene(PhaserLib: typeof Phaser): typeof Phaser.Scene {
         audio.startBGM()
       })
 
-      // 注册 PUA buff 接口供 React 层调用
+      // 注册 PUA buff 接口 + HC 查询/扣除接口供 React 层调用
       if (typeof window !== 'undefined') {
         ;(window as any).__gamePuaBuff = (
           effect: string, score: number, title: string
         ) => {
           this.applyPuaBuff(effect, score, title)
         }
+        // 查询当前 HC
+        ;(window as any).__gameGetHC = () => this.manager.hc
+        // 尝试扣除 HC，成功返回 true，不足返回 false
+        ;(window as any).__gameSpendHC = (amount: number): boolean => {
+          return this.manager.spendHC(amount)
+        }
       }
 
       this.setupInteraction()