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

put/web/src/components/TriggerGroupEditor.vue

@@ -15,9 +15,17 @@
               <el-option v-for="n in 5" :key="n" :label="`Lv${n}`" :value="n" />
             </el-select>
           </el-form-item>
-          <el-form-item label="t_num (1=每次,3≈33%,4≈25%)">
+          <el-form-item label="t_num 次数阈值(1=每次)">
             <el-input-number v-model="entry.t_num" :min="1" :controls="false" style="width: 100%" />
           </el-form-item>
+          <template v-if="chanceVisible">
+            <el-form-item label="t_chance 触发概率%(空=100)">
+              <el-input-number v-model="entry.t_chance" :min="0" :max="100" :controls="false" style="width: 100%" placeholder="缺省必触发" />
+            </el-form-item>
+            <el-form-item label="pity_add 保底叠加%(空=0)">
+              <el-input-number v-model="entry.pity_add" :min="0" :max="100" :controls="false" style="width: 100%" placeholder="未触发时下次概率增量" />
+            </el-form-item>
+          </template>
           <el-form-item label="组名（仅第1档）" v-if="idx === 0">
             <el-input v-model="entry.name" />
           </el-form-item>
@@ -42,18 +50,22 @@
 </template>
 
 <script setup>
-import { ref } from 'vue'
+import { computed, ref } from 'vue'
 import OverrideEditor from './OverrideEditor.vue'
 import { defaultTriggerEntry } from '../constants'
 
 const props = defineProps({
   model: { type: Object, required: true },     // TriggerGrouped
+  // 触发组 key（atking/atked/fstart/fend/dead），决定是否展示概率参数
+  group: { type: String, default: '' },
   skillOptions: { type: Array, default: () => [] },
   skillMap: { type: Object, default: () => ({}) },
   // 全部 buff 候选（timed_buff_id 下拉用），由 App 透传
   buffOptions: { type: Array, default: () => [] },
 })
 const newSid = ref(null)
+// 概率参数仅攻/受击触发消费（fstart/fend/dead 固定触发）
+const chanceVisible = computed(() => props.group === 'atking' || props.group === 'atked')
 
 function skillName(sid) {
   return props.skillMap[sid]?.name || ''