refactor(skill&buff): 优化计时buff配置方式

移除冗余的7112/7113buff配置，统一复用7111基础配置
通过新增buff_duration参数实现持续时间和数值的灵活覆写
简化占卜师技能buff的多档成长配置逻辑

assets/script/game/hero/SCastSystem.ts

@@ -490,12 +490,16 @@ export class SCastSystem extends ecs.ComblockSystem implements ecs.ISystemUpdate
             // 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) {
+                // 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;
+                if (config.buff_duration !== undefined) buffOverrides.duration = config.buff_duration;
                 buffManager.applyBuff(
                     target.ent,
                     config.timed_buff_id,
                     _cAttrsComp.hero_uuid,
                     _cAttrsComp.ap,
-                    config.buff_value !== undefined ? { value: config.buff_value } : undefined
+                    Object.keys(buffOverrides).length > 0 ? buffOverrides : undefined
                 );
                 return;
             }