fix(战斗): 修复英雄移动和施法逻辑

- 移动系统现在会在需要保持距离时也执行移动，避免过于靠近敌人
- 施法系统重构目标选择逻辑，确保在射程内寻找最近敌人
- 添加近战施法距离常量，根据英雄类型动态计算最大施法范围
- 移除不必要的攻击状态检查，优化施法条件判断

assets/script/game/hero/MoveComp.ts

@@ -198,8 +198,8 @@ export class MoveSystem extends ecs.ComblockSystem implements ecs.ISystemUpdate
         const [minRange, maxRange] = this.resolveCombatRange(model, defaultMin, defaultMax);
         const dist = Math.abs(currentX - enemyX);
         const needMoveToFormation = Math.abs(currentX - targetX) > 5;
-        
-        if (dist >= minRange && needMoveToFormation) {
+        const shouldKeepDistance = dist < minRange;
+        if (needMoveToFormation || shouldKeepDistance) {
             const dir = targetX > currentX ? 1 : -1;
             move.direction = dir;
             const speed = model.speed / 3;