feat: 添加工作流组件的边缘处理和循环执行功能，优化订阅和RSS获取操作

src/components/workflow/FetchDownloadsAction.vue

@@ -1,5 +1,7 @@
 <script setup lang="ts">
-const props = defineProps({
+import { Handle, Position } from '@vue-flow/core'
+
+defineProps({
   id: {
     type: String,
     required: true,
@@ -11,12 +13,35 @@ const props = defineProps({
 })
 </script>
 <template>
-  <VCard>
-    <VCardItem prepend-icon="mdi-download-circle-outline">
+  <VCard max-width="20rem">
+    <Handle id="edge_in" type="target" :position="Position.Left" />
+    <VCardItem>
+      <template v-slot:prepend>
+        <VAvatar>
+          <VIcon icon="mdi-progress-download" size="x-large"></VIcon>
+        </VAvatar>
+      </template>
       <VCardTitle>获取下载任务</VCardTitle>
       <VCardSubtitle>获取下载任务，更新任务状态</VCardSubtitle>
     </VCardItem>
-    <VDivider />
-    <VCardText></VCardText>
+    <VCardText>
+      <VRow>
+        <VCol cols="12">
+          <VSwitch v-model="data.loop" label="循环执行" />
+        </VCol>
+        <VCol cols="12">
+          <VTextField
+            v-model="data.loop_interval"
+            :disabled="!data.loop"
+            type="number"
+            label="循环间隔 (秒)"
+            outlined
+            dense
+            clearable
+          />
+        </VCol>
+      </VRow>
+    </VCardText>
+    <Handle id="edge_out" type="source" :position="Position.Right" />
   </VCard>
 </template>