feat: DRATIO supports multiple threshold-ratio levels

Replace single threshold+minRatio with levels array

Card header: \u4e0b\u8f7d\u91cf\u5206\u7ea7\u63a7\u5236\uff082\u7ea7\uff09

Card body: editable rows with add/delete buttons per level

Default preset: 100GB\u21921.0, 500GB\u21922.0, 1000GB\u21923.0

Auto-migrate old single-value format on load

web/src/views/RiskRules.vue

@@ -87,7 +87,7 @@
                 <el-icon class="drag-handle"><Rank /></el-icon>
                 <span class="type-tag">{{ typeLabel(rule.type) }}</span>
                 <span v-if="rule.type==='TASK'" class="rule-fixed-text">考核周期 {{ rule.threshold }}天</span>
-                <span v-else-if="rule.type==='DRATIO'" class="rule-fixed-text">下载量 ≥ {{ rule.threshold }}GB 时分享率 ≥ {{ rule.minRatio }}</span>
+                <span v-else-if="rule.type==='DRATIO'" class="rule-fixed-text">下载量分级控制（{{ (rule.levels||[]).length }} 级）</span>
                 <span v-else-if="rule.type==='EXEMPT'" class="rule-fixed-text">永久保留 ≥ {{ rankDisplay(rule.permRank) }} / 封存豁免 ≥ {{ rankDisplay(rule.sealExemptRank) }}</span>
                 <span v-else class="rule-fixed-text">{{ metricLabel(rule.metric) }} {{ condLabel(rule.condition) }} {{ rule.threshold }}{{ rule.unit || '' }}</span>
                 <span class="then-arrow" :style="rule.type==='EXEMPT'?'color:#67c23a':rule.type==='RATIO'||rule.type==='DRATIO'?'color:#e6a23c':''">→</span>
@@ -125,16 +125,16 @@
 
               <!-- DRATIO 动态分享率 -->
               <template v-else-if="rule.type==='DRATIO'">
-                <div class="field-row">
-                  <span class="field-label">下载量阈值</span>
-                  <el-input v-model.number="rule.threshold" size="small" type="number" placeholder="GB" @input="sync" style="width:100px" />
-                  <span class="field-hint">GB（达到此下载量后检查分享率）</span>
-                </div>
-                <div class="field-row">
-                  <span class="field-label">要求分享率</span>
-                  <el-input v-model.number="rule.minRatio" size="small" type="number" :step="0.1" placeholder="分享率" @input="sync" style="width:100px" />
-                  <span class="field-hint">（分享率低于此值则降级至Peasant，7天缓刑后封号/删除账号）</span>
+                <div v-for="(lv, li) in (rule.levels||[])" :key="li" class="field-row">
+                  <span class="field-label">下载量 ≥</span>
+                  <el-input v-model.number="lv.threshold" size="small" type="number" placeholder="GB" @input="sync" style="width:90px" />
+                  <span class="field-hint">GB 时，分享率 ≥</span>
+                  <el-input v-model.number="lv.ratio" size="small" type="number" :step="0.1" placeholder="分享率" @input="sync" style="width:80px" />
+                  <el-button size="small" type="danger" text :icon="Delete" @click="removeDRatioLevel(rule, li)" />
                 </div>
+                <el-button size="small" text type="primary" @click="addDRatioLevel(rule)" style="align-self:flex-start">
+                  <el-icon style="margin-right:2px"><Plus /></el-icon>添加等级
+                </el-button>
               </template>
 
               <!-- EXEMPT 等级豁免 -->
@@ -182,7 +182,7 @@
 
 <script setup>
 import { ref, computed, onMounted } from 'vue'
-import { ArrowDown, ArrowUp, Rank, Delete, Refresh } from '@element-plus/icons-vue'
+import { ArrowDown, ArrowUp, Rank, Delete, Refresh, Plus } from '@element-plus/icons-vue'
 import api from '../api'
 
 // ============ 选项配置 ============
@@ -270,7 +270,7 @@ const presets = [
   // 新人考核
   { name:'新人考核',           type:'TASK', threshold:30, unit:'天', description:'新注册用户需在考核周期内完成各项要求' },
   // 动态分享率
-  { name:'动态分享率',         type:'DRATIO', threshold:100, minRatio:1.0, unit:'GB', description:'下载量达到阈值时分享率不低于要求值' },
+  { name:'动态分享率',         type:'DRATIO', levels:[{threshold:100,ratio:1.0},{threshold:500,ratio:2.0},{threshold:1000,ratio:3.0}], description:'下载量分级控制分享率' },
   // 等级豁免
   { name:'等级豁免',           type:'EXEMPT', permRank:'Elite User', sealExemptRank:'Power User', description:'达到等级的账号可豁免清理' },
 ]
@@ -284,7 +284,20 @@ const dragIdx = ref(null)
 const fmt = (t) => t ? (t.substring(0,19)||'').replace('T',' ') : '-'
 
 const parsed = computed({
-  get() { try { const arr = JSON.parse(editorJson.value); return Array.isArray(arr) ? arr : [] } catch { return [] } },
+  get() {
+    try {
+      const arr = JSON.parse(editorJson.value)
+      if (!Array.isArray(arr)) return []
+      // migrate old DRATIO format
+      for (const r of arr) {
+        if (r.type === 'DRATIO' && !r.levels && r.threshold !== undefined) {
+          r.levels = [{ threshold: r.threshold || 100, ratio: r.minRatio || 1.0 }]
+          delete r.threshold; delete r.minRatio
+        }
+      }
+      return arr
+    } catch { return [] }
+  },
   set(v) { editorJson.value = JSON.stringify(v, null, 2) }
 })
 
@@ -314,9 +327,12 @@ const ruleText = (r) => {
   const metric = metricLabel(r.metric)
   const cond = condLabel(r.condition)
   const val = `${metric}${cond}${r.threshold}${r.unit||''}`
-  if (r.type === 'DRATIO' || r.type === 'RATIO') {
-    const prefix = r.type === 'DRATIO' ? `动态分享率：下载量 ≥ ${r.threshold}GB 时分享率 ≥ ${r.minRatio}` : `分享率：${val}`
-    return `${prefix} → <span style="color:#e6a23c;font-weight:500">封号（缓刑7天）</span>${appText}`
+  if (r.type === 'DRATIO') {
+    const levels = (r.levels||[]).map(l => `下载量≥${l.threshold}GB时分享率≥${l.ratio}`).join('，')
+    return `动态分享率：${levels} → <span style="color:#e6a23c;font-weight:500">封号（缓刑7天）</span>${appText}`
+  }
+  if (r.type === 'RATIO') {
+    return `分享率：${val} → <span style="color:#e6a23c;font-weight:500">封号（缓刑7天）</span>${appText}`
   }
   return `${typeLabel(r.type)}：${val} → <span style="color:#f56c6c;font-weight:500">封号/删除账号</span>${appText}`
 }
@@ -364,6 +380,24 @@ const ensureTaskReqs = (rule) => {
   }
 }
 
+const addDRatioLevel = (rule) => {
+  if (!rule.levels) rule.levels = []
+  rule.levels.push({ threshold: 100, ratio: 1.0 })
+  sync()
+}
+const removeDRatioLevel = (rule, li) => {
+  rule.levels.splice(li, 1)
+  sync()
+}
+const ensureDRatioLevels = (rule) => {
+  if (rule.type === 'DRATIO') {
+    if (rule.levels && rule.levels.length) return
+    // migrate old single-value format
+    rule.levels = [{ threshold: rule.threshold || 100, ratio: rule.minRatio || 1.0 }]
+    delete rule.threshold; delete rule.minRatio
+  }
+}
+
 const ruleKey = (r) => `${r.type}|${r.applicable||''}`
 
 const existsRule = (rule) => {
@@ -373,6 +407,7 @@ const existsRule = (rule) => {
 const addPreset = (p) => {
   const r = { ...p, _fold: false }
   ensureTaskReqs(r)
+  ensureDRatioLevels(r)
   if (existsRule(r)) {
     ElMessage.warning(`规则「${p.name}」已存在，同类型+适用条件只能添加一次`)
     return