feat: 实现药水卡限时强化功能，支持自定义数值覆写

1. 新增Buff数值覆写机制，支持药水卡自定义buff效果数值
2. 重构属性计算逻辑，支持读取药水卡传递的覆写值
3. 新增多组限时强化Buff与药水卡配置
4. 优化UI数值显示，实时展示最终属性值
5. 新增多维度调试日志方便排查问题

assets/script/game/hero/BuffSystem.ts

@@ -60,6 +60,7 @@ export class BuffSystem extends ecs.ComblockSystem implements ecs.ISystemUpdate
                 if (cfg.duration > 0 && layer.remaining <= 0) {
                     layers.splice(i, 1);
                     anyChanged = true;
+                    console.log(`[BuffSystem] buff 到期移除: ${cfg.name}(${buffId}) eid=${e.eid} 剩余层数=${layers.length}`);
                 }
             }
 
@@ -90,8 +91,10 @@ export class BuffSystem extends ecs.ComblockSystem implements ecs.ISystemUpdate
         while (layer.tick_acc >= tick.interval) {
             layer.tick_acc -= tick.interval;
             // 按 ap 缩放后取整：floor(dmg * (1 + ap_snapshot * scale_pct / 10000))
+            // damage_or_heal 优先取药水卡覆写值
+            const baseAmount = layer.value_override !== undefined ? layer.value_override : tick.damage_or_heal;
             const scale = 1 + layer.source_ap_snapshot * tick.scale_by_ap_pct / 10000;
-            const amount = Math.floor(tick.damage_or_heal * scale);
+            const amount = Math.floor(baseAmount * scale);
             attrs.add_hp(amount);
         }
     }