feat: 编辑器增加「重置」和「丢弃预览版」按钮，支持回退预览版快照

web/src/views/RiskRules.vue

@@ -41,9 +41,11 @@
       </div>
       <div style="display:flex;gap:8px">
         <el-button size="small" type="primary" @click="saveRules" :loading="saving">保存</el-button>
+        <el-button v-if="hasUnsavedChanges" size="small" @click="resetEditor" type="warning">重置</el-button>
         <el-button size="small" @click="uploadRules" :loading="uploading">上传</el-button>
         <el-button v-if="snapshotStatus" size="small" @click="savePreview" :loading="savingPreview">保存预览版</el-button>
         <el-button v-if="snapshotStatus?.draft.exists" size="small" type="success" @click="publishSnapshot" :loading="publishing">发布正式版</el-button>
+        <el-button v-if="snapshotStatus?.draft.exists" size="small" type="danger" @click="discardDraft" :loading="discardingDraft">丢弃预览版</el-button>
         <el-button size="small" @click="editType=''">返回列表</el-button>
       </div>
     </div>
@@ -279,7 +281,7 @@ const presets = [
 ]
 
 // ============ 状态 ============
-const loading = ref(false), saving = ref(false), uploading = ref(false), savingPreview = ref(false), publishing = ref(false)
+const loading = ref(false), saving = ref(false), uploading = ref(false), savingPreview = ref(false), publishing = ref(false), discardingDraft = ref(false)
 const sites = ref([]), rulesMap = ref({})
 const editType = ref(''), editorJson = ref('[]'), originalJson = ref('')
 const snapshotStatus = ref(null)
@@ -403,6 +405,22 @@ const publishSnapshot = async () => {
   finally { publishing.value = false }
 }
 
+const resetEditor = () => {
+  editorJson.value = originalJson.value
+  ElMessage.success('已重置到上次保存的状态')
+}
+
+const discardDraft = async () => {
+  try { await ElMessageBox.confirm('确认丢弃预览版？将回退到正式版。', '丢弃预览版', {confirmButtonText:'确认丢弃',type:'warning'}) } catch { return }
+  discardingDraft.value = true
+  try {
+    await api.raw.post('/admin/sites/' + editType.value + '/discard-draft')
+    ElMessage.success('预览版已丢弃，当前为正式版')
+    fetchSnapshotStatus()
+  } catch { ElMessage.error('丢弃预览版失败') }
+  finally { discardingDraft.value = false }
+}
+
 const sync = () => { editorJson.value = JSON.stringify(parsed.value, null, 2) }
 
 const confirmRemove = async (idx) => {