refactor: 提取 ModelMultiSelect 组件并支持失效模型检测

- 新增 ModelMultiSelect 组件，支持显示和移除已失效的模型
- 新增 useInvalidModels composable 检测 allowed_models 中的无效引用
- 重构 StandaloneKeyFormDialog 和 UserFormDialog 使用新组件
- 补充 GlobalModel 删除逻辑的设计说明注释

frontend/src/components/common/ModelMultiSelect.vue

@@ -0,0 +1,117 @@
+<template>
+  <div class="space-y-2">
+    <Label class="text-sm font-medium">允许的模型</Label>
+    <div class="relative">
+      <button
+        type="button"
+        class="w-full h-10 px-3 border rounded-lg bg-background text-left flex items-center justify-between hover:bg-muted/50 transition-colors"
+        @click="isOpen = !isOpen"
+      >
+        <span :class="modelValue.length ? 'text-foreground' : 'text-muted-foreground'">
+          {{ modelValue.length ? `已选择 ${modelValue.length} 个` : '全部可用' }}
+          <span
+            v-if="invalidModels.length"
+            class="text-destructive"
+          >({{ invalidModels.length }} 个已失效)</span>
+        </span>
+        <ChevronDown
+          class="h-4 w-4 text-muted-foreground transition-transform"
+          :class="isOpen ? 'rotate-180' : ''"
+        />
+      </button>
+      <div
+        v-if="isOpen"
+        class="fixed inset-0 z-[80]"
+        @click.stop="isOpen = false"
+      />
+      <div
+        v-if="isOpen"
+        class="absolute z-[90] w-full mt-1 bg-popover border rounded-lg shadow-lg max-h-48 overflow-y-auto"
+      >
+        <!-- 失效模型（置顶显示，只能取消选择） -->
+        <div
+          v-for="modelName in invalidModels"
+          :key="modelName"
+          class="flex items-center gap-2 px-3 py-2 hover:bg-muted/50 cursor-pointer bg-destructive/5"
+          @click="removeModel(modelName)"
+        >
+          <input
+            type="checkbox"
+            :checked="true"
+            class="h-4 w-4 rounded border-gray-300 cursor-pointer"
+            @click.stop
+            @change="removeModel(modelName)"
+          >
+          <span class="text-sm text-destructive">{{ modelName }}</span>
+          <span class="text-xs text-destructive/70">(已失效)</span>
+        </div>
+        <!-- 有效模型 -->
+        <div
+          v-for="model in models"
+          :key="model.name"
+          class="flex items-center gap-2 px-3 py-2 hover:bg-muted/50 cursor-pointer"
+          @click="toggleModel(model.name)"
+        >
+          <input
+            type="checkbox"
+            :checked="modelValue.includes(model.name)"
+            class="h-4 w-4 rounded border-gray-300 cursor-pointer"
+            @click.stop
+            @change="toggleModel(model.name)"
+          >
+          <span class="text-sm">{{ model.name }}</span>
+        </div>
+        <div
+          v-if="models.length === 0 && invalidModels.length === 0"
+          class="px-3 py-2 text-sm text-muted-foreground"
+        >
+          暂无可用模型
+        </div>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref, computed } from 'vue'
+import { Label } from '@/components/ui'
+import { ChevronDown } from 'lucide-vue-next'
+import { useInvalidModels } from '@/composables/useInvalidModels'
+
+export interface ModelWithName {
+  name: string
+}
+
+const props = defineProps<{
+  modelValue: string[]
+  models: ModelWithName[]
+}>()
+
+const emit = defineEmits<{
+  'update:modelValue': [value: string[]]
+}>()
+
+const isOpen = ref(false)
+
+// 检测失效模型
+const { invalidModels } = useInvalidModels(
+  computed(() => props.modelValue),
+  computed(() => props.models)
+)
+
+function toggleModel(name: string) {
+  const newValue = [...props.modelValue]
+  const index = newValue.indexOf(name)
+  if (index === -1) {
+    newValue.push(name)
+  } else {
+    newValue.splice(index, 1)
+  }
+  emit('update:modelValue', newValue)
+}
+
+function removeModel(name: string) {
+  const newValue = props.modelValue.filter(m => m !== name)
+  emit('update:modelValue', newValue)
+}
+</script>

frontend/src/components/common/index.ts

@@ -7,3 +7,6 @@
 export { default as EmptyState } from './EmptyState.vue'
 export { default as AlertDialog } from './AlertDialog.vue'
 export { default as LoadingState } from './LoadingState.vue'
+
+// 表单组件
+export { default as ModelMultiSelect } from './ModelMultiSelect.vue'

frontend/src/composables/useInvalidModels.ts

@@ -0,0 +1,34 @@
+import { computed, type Ref, type ComputedRef } from 'vue'
+
+/**
+ * 检测失效模型的 composable
+ *
+ * 用于检测 allowed_models 中已不存在于 globalModels 的模型名称，
+ * 这些模型可能已被删除但引用未清理。
+ *
+ * @example
+ * ```typescript
+ * const { invalidModels } = useInvalidModels(
+ *   computed(() => form.value.allowed_models),
+ *   globalModels
+ * )
+ * ```
+ */
+export interface ModelWithName {
+  name: string
+}
+
+export function useInvalidModels<T extends ModelWithName>(
+  allowedModels: Ref<string[]> | ComputedRef<string[]>,
+  globalModels: Ref<T[]>
+): { invalidModels: ComputedRef<string[]> } {
+  const validModelNames = computed(() =>
+    new Set(globalModels.value.map(m => m.name))
+  )
+
+  const invalidModels = computed(() =>
+    allowedModels.value.filter(name => !validModelNames.value.has(name))
+  )
+
+  return { invalidModels }
+}

frontend/src/features/api-keys/components/StandaloneKeyFormDialog.vue

@@ -244,55 +244,10 @@
           </div>
 
           <!-- 模型多选下拉框 -->
-          <div class="space-y-2">
-            <Label class="text-sm font-medium">允许的模型</Label>
-            <div class="relative">
-              <button
-                type="button"
-                class="w-full h-10 px-3 border rounded-lg bg-background text-left flex items-center justify-between hover:bg-muted/50 transition-colors"
-                @click="modelDropdownOpen = !modelDropdownOpen"
-              >
-                <span :class="form.allowed_models.length ? 'text-foreground' : 'text-muted-foreground'">
-                  {{ form.allowed_models.length ? `已选择 ${form.allowed_models.length} 个` : '全部可用' }}
-                </span>
-                <ChevronDown
-                  class="h-4 w-4 text-muted-foreground transition-transform"
-                  :class="modelDropdownOpen ? 'rotate-180' : ''"
+          <ModelMultiSelect
+            v-model="form.allowed_models"
+            :models="globalModels"
           />
-              </button>
-              <div
-                v-if="modelDropdownOpen"
-                class="fixed inset-0 z-[80]"
-                @click.stop="modelDropdownOpen = false"
-              />
-              <div
-                v-if="modelDropdownOpen"
-                class="absolute z-[90] w-full mt-1 bg-popover border rounded-lg shadow-lg max-h-48 overflow-y-auto"
-              >
-                <div
-                  v-for="model in globalModels"
-                  :key="model.name"
-                  class="flex items-center gap-2 px-3 py-2 hover:bg-muted/50 cursor-pointer"
-                  @click="toggleSelection('allowed_models', model.name)"
-                >
-                  <input
-                    type="checkbox"
-                    :checked="form.allowed_models.includes(model.name)"
-                    class="h-4 w-4 rounded border-gray-300 cursor-pointer"
-                    @click.stop
-                    @change="toggleSelection('allowed_models', model.name)"
-                  >
-                  <span class="text-sm">{{ model.name }}</span>
-                </div>
-                <div
-                  v-if="globalModels.length === 0"
-                  class="px-3 py-2 text-sm text-muted-foreground"
-                >
-                  暂无可用模型
-                </div>
-              </div>
-            </div>
-          </div>
         </div>
       </div>
     </form>
@@ -327,6 +282,7 @@ import {
 } from '@/components/ui'
 import { Plus, SquarePen, Key, Shield, ChevronDown } from 'lucide-vue-next'
 import { useFormDialog } from '@/composables/useFormDialog'
+import { ModelMultiSelect } from '@/components/common'
 import { getProvidersSummary } from '@/api/endpoints/providers'
 import { getGlobalModels } from '@/api/global-models'
 import { adminApi } from '@/api/admin'
@@ -363,7 +319,6 @@ const saving = ref(false)
 // 下拉框状态
 const providerDropdownOpen = ref(false)
 const apiFormatDropdownOpen = ref(false)
-const modelDropdownOpen = ref(false)
 
 // 选项数据
 const providers = ref<ProviderWithEndpointsSummary[]>([])
@@ -397,7 +352,6 @@ function resetForm() {
   }
   providerDropdownOpen.value = false
   apiFormatDropdownOpen.value = false
-  modelDropdownOpen.value = false
 }
 
 function loadKeyData() {

frontend/src/features/users/components/UserFormDialog.vue

@@ -316,55 +316,10 @@
           </div>
 
           <!-- 模型多选下拉框 -->
-          <div class="space-y-2">
-            <Label class="text-sm font-medium">允许的模型</Label>
-            <div class="relative">
-              <button
-                type="button"
-                class="w-full h-10 px-3 border rounded-lg bg-background text-left flex items-center justify-between hover:bg-muted/50 transition-colors"
-                @click="modelDropdownOpen = !modelDropdownOpen"
-              >
-                <span :class="form.allowed_models.length ? 'text-foreground' : 'text-muted-foreground'">
-                  {{ form.allowed_models.length ? `已选择 ${form.allowed_models.length} 个` : '全部可用' }}
-                </span>
-                <ChevronDown
-                  class="h-4 w-4 text-muted-foreground transition-transform"
-                  :class="modelDropdownOpen ? 'rotate-180' : ''"
+          <ModelMultiSelect
+            v-model="form.allowed_models"
+            :models="globalModels"
           />
-              </button>
-              <div
-                v-if="modelDropdownOpen"
-                class="fixed inset-0 z-[80]"
-                @click.stop="modelDropdownOpen = false"
-              />
-              <div
-                v-if="modelDropdownOpen"
-                class="absolute z-[90] w-full mt-1 bg-popover border rounded-lg shadow-lg max-h-48 overflow-y-auto"
-              >
-                <div
-                  v-for="model in globalModels"
-                  :key="model.name"
-                  class="flex items-center gap-2 px-3 py-2 hover:bg-muted/50 cursor-pointer"
-                  @click="toggleSelection('allowed_models', model.name)"
-                >
-                  <input
-                    type="checkbox"
-                    :checked="form.allowed_models.includes(model.name)"
-                    class="h-4 w-4 rounded border-gray-300 cursor-pointer"
-                    @click.stop
-                    @change="toggleSelection('allowed_models', model.name)"
-                  >
-                  <span class="text-sm">{{ model.name }}</span>
-                </div>
-                <div
-                  v-if="globalModels.length === 0"
-                  class="px-3 py-2 text-sm text-muted-foreground"
-                >
-                  暂无可用模型
-                </div>
-              </div>
-            </div>
-          </div>
         </div>
       </div>
     </form>
@@ -404,10 +359,12 @@ import {
 } from '@/components/ui'
 import { UserPlus, SquarePen, ChevronDown } from 'lucide-vue-next'
 import { useFormDialog } from '@/composables/useFormDialog'
+import { ModelMultiSelect } from '@/components/common'
 import { getProvidersSummary } from '@/api/endpoints/providers'
 import { getGlobalModels } from '@/api/global-models'
 import { adminApi } from '@/api/admin'
 import { log } from '@/utils/logger'
+import type { ProviderWithEndpointsSummary, GlobalModelResponse } from '@/api/endpoints/types'
 
 export interface UserFormData {
   id?: string
@@ -440,11 +397,10 @@ const roleSelectOpen = ref(false)
 // 下拉框状态
 const providerDropdownOpen = ref(false)
 const endpointDropdownOpen = ref(false)
-const modelDropdownOpen = ref(false)
 
 // 选项数据
-const providers = ref<any[]>([])
-const globalModels = ref<any[]>([])
+const providers = ref<ProviderWithEndpointsSummary[]>([])
+const globalModels = ref<GlobalModelResponse[]>([])
 const apiFormats = ref<Array<{ value: string; label: string }>>([])
 
 // 表单数据

src/services/model/global_model.py

@@ -148,6 +148,8 @@ class GlobalModelService:
         删除 GlobalModel
 
         默认行为: 级联删除所有关联的 Provider 模型实现
+        注意: 不清理 API Key 和 User 的 allowed_models 引用，
+        保留无效引用可让用户在前端看到"已失效"的模型，便于手动清理或等待重建同名模型
         """
         global_model = GlobalModelService.get_global_model(db, global_model_id)