feat(skill): 添加计时buff目标覆写功能

1. 新增BuffTarget枚举定义计时buff的四种施加目标类型
2. 扩展SkillOverrides接口添加buff_target配置项
3. 实现resolveBuffTargets方法解析buff实际施加目标
4. 调整普攻buff施加逻辑适配新的目标配置规则
5. 修复伤害技能误给敌方挂友方buff的问题
6. 清理英雄技能配置中多余的summon_count参数

assets/script/game/hero/SCastSystem.ts

@@ -2,7 +2,7 @@ import { ecs } from "../../../../extensions/oops-plugin-framework/assets/libs/ec
 import { Vec3, Prefab, instantiate, tween, Node } from "cc";
 import { HeroAttrsComp } from "./HeroAttrsComp";
 import { HeroViewComp } from "./HeroViewComp";
-import { DTType, RType, SkillConfig, SkillKind, SkillSet, TGroup, SkillOverrides, mergeSkillParams } from "../common/config/SkillSet";
+import { DTType, RType, SkillConfig, SkillKind, SkillSet, TGroup, SkillOverrides, mergeSkillParams, BuffTarget } from "../common/config/SkillSet";
 import { Skill } from "../skill/Skill";
 import { SkillView } from "../skill/SkillView";
 import { smc } from "../common/SingletonModuleComp";
@@ -545,7 +545,8 @@ export class SCastSystem extends ecs.ComblockSystem implements ecs.ISystemUpdate
         if (config.buff_type !== undefined) {
             // 计时性 buff：配置了 timed_buff_id 时走 buffManager 限时路径，
             // 同一技能不应既永久加成又限时加成，故提前 return 跳过下方永久 add_* 逻辑
-            if (config.timed_buff_id) {
+            // buff_target=Enemy 时 timed_buff_id 已在 applyFriendlySkillEffects 入口分流到敌方网格，此处跳过避免误挂友方
+            if (config.timed_buff_id && config.buff_target !== BuffTarget.Enemy) {
                 // 汇总 buff 覆写参数：value 覆写修饰数值，duration 覆写持续时间
                 const buffOverrides: { value?: number; duration?: number } = {};
                 if (config.buff_value !== undefined) buffOverrides.value = config.buff_value;