渠道: 模型名称映射(网关生效 + 渠道侧管理)

- 候选渠道携带 upstream_model, prepareUpstream 改写请求体 model 字段为上游名
- 新增渠道视角绑定 CRUD: GET/POST/PATCH/DELETE /admin/channels/:id/models
- 前端渠道页新增"模型映射": 列出绑定、内联改上游名、解除、添加
- rewriteModel 三种协议通用(model 均在顶层)

Co-Authored-By: Claude <noreply@anthropic.com>

web/src/views/admin/ChannelsView.vue

@@ -123,6 +123,82 @@ async function importModels(ch: Channel) {
   }
 }
 
+// --- 渠道模型映射 ---
+const modelsOpen = ref(false)
+const mappingChan = ref<Channel | null>(null)
+const mappings = ref<ChannelModelMapping[]>([])
+const availableModels = ref<string[]>([])
+const mappingForm = reactive({ model_name: '', upstream_model: '', weight: 1 })
+
+async function openModels(ch: Channel) {
+  mappingChan.value = ch
+  mappingForm.model_name = ''
+  mappingForm.upstream_model = ''
+  mappingForm.weight = 1
+  modelsOpen.value = true
+  await Promise.all([loadMappings(), loadAvailableModels()])
+}
+
+async function loadMappings() {
+  if (!mappingChan.value) return
+  try {
+    const { data } = await http.get(`/admin/channels/${mappingChan.value.id}/models`)
+    mappings.value = data.data.items
+  } catch (e) {
+    toast.err(errMsg(e))
+  }
+}
+
+async function loadAvailableModels() {
+  try {
+    const { data } = await http.get('/admin/models')
+    availableModels.value = (data.data.items as { name: string }[]).map((m) => m.name)
+  } catch {
+    /* 忽略 */
+  }
+}
+
+async function addMapping() {
+  if (!mappingChan.value || !mappingForm.model_name) return
+  try {
+    await http.post(`/admin/channels/${mappingChan.value.id}/models`, {
+      model_name: mappingForm.model_name,
+      upstream_model: mappingForm.upstream_model,
+      weight: Number(mappingForm.weight) || 1,
+    })
+    toast.ok('已绑定')
+    mappingForm.upstream_model = ''
+    await loadMappings()
+  } catch (e) {
+    toast.err(errMsg(e))
+  }
+}
+
+async function saveMapping(b: ChannelModelMapping) {
+  if (!mappingChan.value) return
+  try {
+    await http.patch(`/admin/channels/${mappingChan.value.id}/models/${b.id}`, {
+      upstream_model: b.upstream_model,
+    })
+    toast.ok('已更新')
+    await loadMappings()
+  } catch (e) {
+    toast.err(errMsg(e))
+  }
+}
+
+async function deleteMapping(b: ChannelModelMapping) {
+  if (!mappingChan.value) return
+  if (!confirm(`解除模型 ${b.model_name} 的绑定？`)) return
+  try {
+    await http.delete(`/admin/channels/${mappingChan.value.id}/models/${b.id}`)
+    toast.ok('已解除')
+    await loadMappings()
+  } catch (e) {
+    toast.err(errMsg(e))
+  }
+}
+
 onMounted(load)
 </script>
 
@@ -176,6 +252,7 @@ onMounted(load)
                     {{ busyId === ch.id ? '测试中…' : '测试' }}
                   </button>
                   <button class="text-xs text-muted hover:text-accent" @click="importModels(ch)">导入模型</button>
+                  <button class="text-xs text-muted hover:text-accent" @click="openModels(ch)">模型映射</button>
                   <button class="text-xs text-muted hover:text-ink" @click="openEdit(ch)">编辑</button>
                   <button class="text-xs text-muted hover:text-err" @click="remove(ch)">删除</button>
                 </div>
@@ -235,5 +312,57 @@ onMounted(load)
         <Button :loading="saving" @click="save">{{ editing ? '保存' : '创建' }}</Button>
       </template>
     </Modal>
+
+    <!-- 模型名称映射 -->
+    <Modal :open="modelsOpen" :title="`模型映射 · ${mappingChan?.name}`" @close="modelsOpen = false">
+      <div class="mb-3 text-xs text-muted">客户端调用「模型名」时，网关转发为右侧「上游名称」。</div>
+      <table class="w-full text-sm">
+        <thead>
+          <tr class="border-b border-edge text-left text-xs text-muted">
+            <th scope="col" class="px-3 py-2 font-medium">模型</th>
+            <th scope="col" class="px-3 py-2 font-medium">上游名称</th>
+            <th scope="col" class="px-3 py-2 font-medium">权重</th>
+            <th scope="col" class="px-3 py-2" />
+          </tr>
+        </thead>
+        <tbody>
+          <tr v-for="b in mappings" :key="b.id" class="border-b border-edge last:border-0">
+            <td class="px-3 py-2 font-mono text-xs text-ink">{{ b.model_name }}</td>
+            <td class="px-3 py-2">
+              <input
+                v-model="b.upstream_model"
+                class="h-8 w-full min-w-36 rounded-md border border-edge2 bg-surface px-2 font-mono text-xs text-ink outline-none focus:border-accent"
+              />
+            </td>
+            <td class="px-3 py-2 mono-num text-xs text-muted">{{ b.weight }}</td>
+            <td class="px-3 py-2 text-right">
+              <div class="flex justify-end gap-2.5">
+                <button class="text-xs text-muted hover:text-ink" @click="saveMapping(b)">保存</button>
+                <button class="text-xs text-muted hover:text-err" @click="deleteMapping(b)">解除</button>
+              </div>
+            </td>
+          </tr>
+          <tr v-if="mappings.length === 0">
+            <td colspan="4" class="px-3 py-6 text-center text-xs text-muted">尚未绑定模型，可在下方添加</td>
+          </tr>
+        </tbody>
+      </table>
+      <div class="mt-3 flex items-center gap-2 border-t border-edge pt-3">
+        <select
+          v-model="mappingForm.model_name"
+          class="h-9 flex-1 rounded-md border border-edge2 bg-surface px-2 text-xs text-ink outline-none focus:border-accent"
+        >
+          <option value="" disabled>选择全局模型</option>
+          <option v-for="m in availableModels" :key="m" :value="m">{{ m }}</option>
+        </select>
+        <input
+          v-model="mappingForm.upstream_model"
+          placeholder="上游名称（默认同名）"
+          class="h-9 w-44 rounded-md border border-edge2 bg-surface px-2 font-mono text-xs outline-none focus:border-accent"
+          @keyup.enter="addMapping"
+        />
+        <Button size="sm" @click="addMapping">绑定</Button>
+      </div>
+    </Modal>
   </div>
 </template>