fix(send-routing): address re-review issues

- Set conversationScene=EXTERNAL in SendEndToEndTest and align account to WECHAT_PERSONAL
- Replace literal account type code with AccountType.WECHAT_PERSONAL.getCode()
- Use replaceFirst for webhook URL placeholder in WeComBotSender
- Remove unused selectDefaultAccount overload
- Hide scene selector for single-chat conversations in admin-web

admin-web/src/views/Conversation.vue

@@ -30,7 +30,7 @@
       <el-table-column prop="channelType" label="渠道" />
       <el-table-column prop="conversationScene" label="场景" width="100">
         <template #default="{ row }">
-          {{ formatConversationScene(row.conversationScene) }}
+          {{ formatConversationScene(row.conversationScene, row.conversationType) }}
         </template>
       </el-table-column>
       <el-table-column prop="channelConversationId" label="渠道会话ID" show-overflow-tooltip />
@@ -76,7 +76,7 @@
         <el-form-item label="渠道">
           <el-input v-model="dialogForm.channelType" placeholder="wecom" />
         </el-form-item>
-        <el-form-item label="场景">
+        <el-form-item v-if="dialogForm.conversationType === 2" label="场景">
           <el-select v-model="dialogForm.conversationScene" placeholder="选择场景" style="width: 100%">
             <el-option label="内部群" :value="1" />
             <el-option label="外部群" :value="2" />
@@ -125,7 +125,7 @@
         <el-form-item label="渠道">
           <el-input v-model="dialogForm.channelType" placeholder="wecom" />
         </el-form-item>
-        <el-form-item label="场景">
+        <el-form-item v-if="dialogForm.conversationType === 2" label="场景">
           <el-select v-model="dialogForm.conversationScene" placeholder="选择场景" style="width: 100%">
             <el-option label="内部群" :value="1" />
             <el-option label="外部群" :value="2" />
@@ -326,6 +326,12 @@ watch([searchQuery, typeFilter], () => {
   currentPage.value = 1
 })
 
+watch(() => dialogForm.conversationType, (val) => {
+  if (val === 1) {
+    dialogForm.conversationScene = undefined
+  }
+})
+
 function resetDialogForm() {
   dialogForm.conversationType = 2
   dialogForm.channelType = 'wecom'
@@ -401,7 +407,8 @@ function formatConversationType(type: number | undefined) {
   return type ?? '-'
 }
 
-function formatConversationScene(scene: number | undefined) {
+function formatConversationScene(scene: number | undefined, type?: number) {
+  if (type === 1) return '-'
   if (scene === 1) return '内部群'
   if (scene === 2) return '外部群'
   return scene ?? '-'