perf: 优化战斗系统内存与性能，增加对象池限制与内存监控面板

- 为Skill和Monster对象池添加最大容量限制（64/24），防止内存泄漏
- 实现DamageQueueComp的环形队列优化，减少数组操作开销
- 在MissionComp中添加内存监控面板，实时显示堆内存、实体数量、对象池状态
- 优化MoveSystem的渲染排序性能，缓存查询结果减少GC压力
- 调整角色控制器UI位置与样式，关闭调试日志减少性能开销
- 战斗结束时自动清理对象池，确保内存可回收

assets/script/game/skill/Skill.ts

@@ -19,6 +19,7 @@ export class Skill extends ecs.Entity {
     private debugMode: boolean = false;
     /** 多键对象池：Map<prefabPath, NodePool> */
     static pools: Map<string, NodePool> = new Map();
+    static readonly MAX_POOL_SIZE: number = 64;
 
     static getFromPool(path: string): Node | null {
         if (this.pools.has(path)) {
@@ -38,7 +39,31 @@ export class Skill extends ecs.Entity {
         if (!this.pools.has(path)) {
             this.pools.set(path, new NodePool());
         }
-        this.pools.get(path)!.put(node);
+        const pool = this.pools.get(path)!;
+        if (pool.size() >= this.MAX_POOL_SIZE) {
+            node.destroy();
+            return;
+        }
+        pool.put(node);
+    }
+
+    static clearPools() {
+        this.pools.forEach((pool) => {
+            pool.clear();
+        });
+        this.pools.clear();
+    }
+
+    static getPoolStats() {
+        let total = 0;
+        this.pools.forEach((pool) => {
+            total += pool.size();
+        });
+        return {
+            paths: this.pools.size,
+            total,
+            maxPerPath: this.MAX_POOL_SIZE
+        };
     }
 
     /** ---------- 数据层 ---------- */