feat(battle): 重构技能施放与战斗距离系统

- 新增技能距离缓存机制，根据英雄类型动态计算最小和最大攻击范围
- 重构SCastSystem实现完整的技能施放逻辑，支持伤害、治疗、护盾和buff技能
- 在Hero和Monster初始化时调用updateSkillDistanceCache预计算技能距离
- 修改HeroMoveSystem和MonMoveSystem使用动态战斗范围，支持撤退逻辑
- 优化Skill实体创建，增加对象池支持
- 添加技能CD触发方法和状态检查方法

assets/script/game/hero/HeroMove.ts

@@ -110,11 +110,13 @@ export class HeroMoveSystem extends ecs.ComblockSystem implements ecs.ISystemUpd
         const currentX = view.node.position.x;
         const enemyX = enemy.node.position.x;
         const dist = Math.abs(currentX - enemyX);
-        const attackRange = 75; // 保持原有的近战判定
+        const [minRange, maxRange] = this.resolveCombatRange(model, 0, 75);
 
         move.direction = enemyX > currentX ? 1 : -1;
 
-        if (dist <= attackRange) {
+        if (dist < minRange) {
+            this.performRetreat(view, move, model, currentX);
+        } else if (dist <= maxRange) {
             view.status_change("idle");
             model.is_atking = true;
         } else {
@@ -134,8 +136,7 @@ export class HeroMoveSystem extends ecs.ComblockSystem implements ecs.ISystemUpd
         const enemyX = enemy.node.position.x;
         const dist = Math.abs(currentX - enemyX);
         
-        const minRange = 120;
-        const maxRange = 360;
+        const [minRange, maxRange] = this.resolveCombatRange(model, 120, 360);
 
         move.direction = enemyX > currentX ? 1 : -1;
 
@@ -164,8 +165,7 @@ export class HeroMoveSystem extends ecs.ComblockSystem implements ecs.ISystemUpd
         const enemyX = enemy.node.position.x;
         const dist = Math.abs(currentX - enemyX);
         
-        const minRange = 360;
-        const maxRange = 720;
+        const [minRange, maxRange] = this.resolveCombatRange(model, 360, 720);
 
         move.direction = enemyX > currentX ? 1 : -1;
 
@@ -245,6 +245,14 @@ export class HeroMoveSystem extends ecs.ComblockSystem implements ecs.ISystemUpd
         }
     }
 
+    private resolveCombatRange(model: HeroAttrsComp, defaultMin: number, defaultMax: number): [number, number] {
+        const minRange = model.getCachedMinSkillDistance();
+        const maxRange = model.getCachedMaxSkillDistance();
+        if (maxRange <= 0) return [defaultMin, defaultMax];
+        const safeMin = Math.max(0, Math.min(minRange, maxRange - 20));
+        return [safeMin, maxRange];
+    }
+
     // --- 辅助方法 ---
 
     private findNearestEnemy(entity: ecs.Entity): HeroViewComp | null {