feat: 新增装备商店系统，调整英雄站位与抽卡逻辑

1.  重构抽卡函数，新增排除装备卡参数，装备卡改为商店直购
2.  添加装备商店面板，支持装备浏览与购买，跨波次保留购买记录
3.  调整英雄出场点位坐标，优化战场布局
4.  扩展技能卡槽位，新增两行技能槽位置
5.  重构EquipListComp组件，适配装备商店UI逻辑
6.  删除废弃的melist预制件与相关元文件
7.  调整hnode预制件布局参数

assets/script/game/map/MissSkillsComp.ts

@@ -63,16 +63,16 @@ export class MissSkillsComp extends CCComp {
      * 第 2 行 y=320：x = -320, -240, -160, -80, 0
      */
     private slots: SkillBoxSlot[] = [
-        { x: -310, y: 200, used: false, node: null },
-        { x: -220, y: 200, used: false, node: null },
-        { x: -130, y: 200, used: false, node: null },
-        { x: -40, y: 200, used: false, node: null },
-        { x: 50, y: 200, used: false, node: null },
         { x: -310, y: 300, used: false, node: null },
         { x: -220, y: 300, used: false, node: null },
         { x: -130, y: 300, used: false, node: null },
         { x: -40, y: 300, used: false, node: null },
         { x: 50, y: 300, used: false, node: null },
+        { x: -310, y: 400, used: false, node: null },
+        { x: -220, y: 400, used: false, node: null },
+        { x: -130, y: 400, used: false, node: null },
+        { x: -40, y: 400, used: false, node: null },
+        { x: 50, y: 400, used: false, node: null },
     ];
 
     /** 注册事件监听 */