修复(卡牌&施法系统): 修正卡牌消耗与施法目标选择逻辑

调整“持续天降火球”技能卡牌的法力消耗从5改为0，修复错误配置；优化敌方技能的施法目标选择逻辑，通过索敌范围获取真实敌人位置，替代原有的固定偏移位置，提升技能释放准确性

assets/script/game/common/config/CardSet.ts

@@ -139,7 +139,7 @@ CardPoolList.push(
         is_inst: true, t_times: 1, t_inv: 0, keep_waves: 15, overrides: { ap: 50 }
     },
     {
-        uuid: 6101, type: CardType.Skill, cost: 5, weight: 10, pool_lv: 1, wave: 1, kind: CKind.Skill, card_lv: 1,
+        uuid: 6101, type: CardType.Skill, cost: 0, weight: 10, pool_lv: 1, wave: 1, kind: CKind.Skill, card_lv: 1,
         name: "持续天降火球", info: "战斗中每隔3秒释放一个火球，造成300%伤害，持续2波次",
         is_inst: false, t_times: 999, t_inv: 3, keep_waves: 15, overrides: { TGroup: TGroup.Enemy, ap: 300, hit_count: 2 }
     }

assets/script/game/hero/SCastSystem.ts

@@ -112,6 +112,23 @@ export class SCastSystem extends ecs.ComblockSystem implements ecs.ISystemUpdate
         mockAttrs.freeze_chance = 0;
         mockAttrs.puncture_chance = 0;
         mockAttrs.fac = FacSet.HERO;
+        mockAttrs.type = HType.Long; // 假定为远程，拥有较长索敌范围
+        
+        let targetPos: Vec3 | null = null;
+        if (!isFriendly) {
+            // 伪造一个 view 供找敌逻辑使用，位置为 spawnPos
+            const mockView = {
+                node: { position: spawnPos }
+            } as any;
+            // 获取全屏索敌范围
+            const maxRange = this.resolveMaxCastRange(mockAttrs, mockAttrs.type as HType);
+            const target = this.findNearestEnemyInRange(mockAttrs, mockView, maxRange);
+            if (target && target.node) {
+                targetPos = this.resolveEnemyCastTargetPos(config, mockAttrs, mockView, target, maxRange);
+            }
+            // 如果全屏都没找到敌人，直接放弃释放伤害技能
+            if (!targetPos) return;
+        }
         
         for (let i = 0; i < castTimes; i++) {
             if (isFriendly) {
@@ -119,7 +136,7 @@ export class SCastSystem extends ecs.ComblockSystem implements ecs.ISystemUpdate
                 if (friendlyTargets.length === 0) continue;
                 this.applyFriendlySkillEffects(s_uuid, cardLv, config, null as any, mockAttrs, friendlyTargets, spawnPos);
             } else {
-                const enemyTargetPos = this.resolveRepeatCastTargetPos(new Vec3(spawnPos.x + 300, spawnPos.y, spawnPos.z), i);
+                const enemyTargetPos = this.resolveRepeatCastTargetPos(targetPos, i);
                 this.createSkillEntityForCard(s_uuid, cardLv, mockAttrs, spawnPos, enemyTargetPos, i, overrides);
             }
         }