feat(skill): add trigger probability and pity system for attack/attacked triggers

1. 新增技能触发概率配置与保底叠加机制，仅对攻击/受击触发生效
2. 前端编辑器新增t_chance概率与pity_add保底增量配置项
3. 技能描述文案支持展示触发概率
4. 运行时新增概率判定与保底缓存逻辑，兼容存量配置

assets/script/game/common/HeroSkillText.ts

@@ -81,11 +81,13 @@ const PLACEHOLDER_PATTERN = /\{(\w+)\}/g;
  * atking/atked 为周期循环触发（运行时按次数取模判定），拼为"每攻击N次"/"每受击N次"
  * 表达循环语义（N=1 时退化为"每次攻击"/"每次受击"）；其余类型直接用触发名（召唤/死亡后/回合开始）。
  */
-function buildTriggerLabel(type: SkillTriggerType, tNum: number): string {
+function buildTriggerLabel(type: SkillTriggerType, tNum: number, chance?: number): string {
     if (type === SkillTriggerType.Atking || type === SkillTriggerType.Atked) {
+        // 配置了 t_chance 且 < 100 时追加概率说明（保底叠加为隐藏机制，不在文案展示）
+        const chanceSeg = chance !== undefined && chance < 100 ? `(${valueRich(Math.round(chance))}%概率)` : "";
         return tNum <= 1
-            ? `每次${SkillTriggerName[type]}`
-            : `每${SkillTriggerName[type]}${valueRich(tNum)}次`;
+            ? `每次${SkillTriggerName[type]}${chanceSeg}`
+            : `每${SkillTriggerName[type]}${valueRich(tNum)}次${chanceSeg}`;
     }
     return SkillTriggerName[type];
 }
@@ -226,7 +228,7 @@ export function buildHeroSkillDesc(heroUuid: number, showName: boolean = true, s
             tmpl = tmpl ?? entries[0]?.desc;
             const text = tmpl ? renderDesc(tmpl, skill) : fallbackDesc(skill);
             // 触发语境："每攻击N次"循环语义（buildTriggerLabel），逗号衔接效果文本
-            const trig = buildTriggerLabel(type, item.t_num);
+            const trig = buildTriggerLabel(type, item.t_num, item.t_chance);
             parts.push(`${trig}, ${text}`);
         }
         // dead 组内的复活效果（revive_hp / revive_count）并入同一行
@@ -499,7 +501,7 @@ function collectTriggerTiers(hero: heroInfo, type: SkillTriggerType, skillUuid:
             tNum: e.t_num,
         };
     });
-    const label = buildTriggerLabel(type, sorted[0].t_num);
+    const label = buildTriggerLabel(type, sorted[0].t_num, sorted[0].t_chance);
     return { tiers, label };
 }