fix(providers): 修复 Key 表单状态同步与 streaming 候选状态码处理

前端:
- KeyAllowedModelsEditDialog 同时监听 open 和 apiKey 变化，避免切换 key 时状态未刷新
- KeyFormDialog 新增 api_formats 过滤与默认值逻辑，可用格式变化时自动同步表单
- ProviderDetailDrawer 合并 provider 和 endpoint 的 api_formats 传递给 Key 表单，
  数据刷新后同步 currentEndpoint 和 editingKey 引用

后端:
- mark_candidate_streaming 移除 status_code 参数，streaming 阶段不再提前写入状态码
- 简化 active_requests 中 streaming 请求的完成判断，不再依赖 status_code 条件

frontend/src/features/providers/components/KeyAllowedModelsEditDialog.vue

@@ -717,49 +717,44 @@ function parseAllowedModels(allowed: AllowedModels): string[] {
   return [...allowed]
 }
 
-// 监听对话框打开
-watch(() => props.open, async (open) => {
-  if (open && props.apiKey) {
-    loadingCancelled = false
+async function initializeDialogState(apiKey: EndpointAPIKey) {
+  loadingCancelled = false
 
-    const parsed = parseAllowedModels(props.apiKey.allowed_models ?? null)
-    selectedModels.value = [...parsed]
-    initialSelectedModels.value = [...parsed]
+  const parsed = parseAllowedModels(apiKey.allowed_models ?? null)
+  selectedModels.value = [...parsed]
+  initialSelectedModels.value = [...parsed]
 
-    // 加载锁定的模型
-    const locked = props.apiKey.locked_models ?? []
-    lockedModels.value = [...locked]
-    initialLockedModels.value = [...locked]
+  const locked = apiKey.locked_models ?? []
+  lockedModels.value = [...locked]
+  initialLockedModels.value = [...locked]
 
-    searchQuery.value = ''
-    upstreamModels.value = []
-    upstreamModelsLoaded.value = false
-    allCustomModels.value = []
+  searchQuery.value = ''
+  upstreamModels.value = []
+  upstreamModelsLoaded.value = false
+  allCustomModels.value = []
 
-    // 自动获取模式下展开上游模型，其他收缩；非自动获取模式下全部展开
-    if (props.apiKey.auto_fetch_models) {
-      collapsedGroups.value = new Set(['global', 'custom'])
-    } else {
-      collapsedGroups.value = new Set()
-    }
+  if (apiKey.auto_fetch_models) {
+    collapsedGroups.value = new Set(['global', 'custom'])
+  } else {
+    collapsedGroups.value = new Set()
+  }
 
-    // 加载该 Provider 已关联模型
-    await loadProviderModels()
+  await loadProviderModels()
 
-    // 自动获取模式下，获取上游模型用于显示（但选中状态使用已保存的 allowed_models）
-    if (props.apiKey.auto_fetch_models) {
-      await fetchUpstreamModels()
-      // 注意：不再将所有上游模型自动标记为选中
-      // 因为后端有过滤规则，实际保存的 allowed_models 是过滤后的结果
-      // selectedModels 已在上面从 props.apiKey.allowed_models 初始化
-    }
+  if (apiKey.auto_fetch_models) {
+    await fetchUpstreamModels()
+  }
 
-    // 提取自定义模型（不在提供商模型和上游模型中的）
-    const upstreamModelIdsSet = new Set(upstreamModels.value.map(m => m.id))
-    // 自定义模型是用户手动添加的、不在已知模型列表中的
-    allCustomModels.value = selectedModels.value.filter(m =>
-      !providerModelNamesSet.value.has(m) && !upstreamModelIdsSet.has(m)
-    )
+  const upstreamModelIdsSet = new Set(upstreamModels.value.map(m => m.id))
+  allCustomModels.value = selectedModels.value.filter(m =>
+    !providerModelNamesSet.value.has(m) && !upstreamModelIdsSet.has(m)
+  )
+}
+
+// 监听对话框打开 / 当前 key 变化
+watch([() => props.open, () => props.apiKey], async ([open, apiKey]) => {
+  if (open && apiKey) {
+    await initializeDialogState(apiKey)
   } else {
     loadingCancelled = true
   }

frontend/src/features/providers/components/KeyFormDialog.vue

@@ -377,6 +377,32 @@ function normalizeApiFormat(format: string): string {
   return String(format || '').trim().toLowerCase()
 }
 
+function getAvailableApiFormatSet(): Set<string> {
+  return new Set(props.availableApiFormats.map(normalizeApiFormat))
+}
+
+function filterAvailableApiFormats(formats: string[]): string[] {
+  const availableFormatSet = getAvailableApiFormatSet()
+  if (availableFormatSet.size === 0) {
+    return []
+  }
+
+  return formats.filter(format => availableFormatSet.has(normalizeApiFormat(format)))
+}
+
+function getDefaultApiFormats(): string[] {
+  const endpointFormat = props.endpoint?.api_format
+  if (endpointFormat) {
+    const endpointFormats = filterAvailableApiFormats([endpointFormat])
+    if (endpointFormats.length > 0) {
+      return endpointFormats
+    }
+  }
+
+  const firstAvailableFormat = sortApiFormats(props.availableApiFormats)[0]
+  return firstAvailableFormat ? [firstAvailableFormat] : []
+}
+
 // 按 provider/auth_type 过滤后的可用 API 格式列表
 const visibleApiFormats = computed(() => {
   const sorted = sortApiFormats(props.availableApiFormats)
@@ -486,6 +512,29 @@ watch(
   { immediate: true }
 )
 
+watch(
+  [() => props.availableApiFormats, () => props.open, () => props.editingKey],
+  ([, open, editingKey]) => {
+    if (!open) {
+      return
+    }
+
+    const filtered = filterAvailableApiFormats(form.value.api_formats)
+    if (filtered.length !== form.value.api_formats.length) {
+      form.value.api_formats = [...filtered]
+      return
+    }
+
+    if (!editingKey && form.value.api_formats.length === 0) {
+      const defaults = getDefaultApiFormats()
+      if (defaults.length > 0) {
+        form.value.api_formats = defaults
+      }
+    }
+  },
+  { deep: true, immediate: true }
+)
+
 // 加载能力列表
 async function loadCapabilities() {
   try {
@@ -540,7 +589,7 @@ function resetForm() {
     api_key: '',
     auth_type: defaultAuthType,
     auth_config_text: '',
-    api_formats: [],  // 默认不选中任何格式
+    api_formats: getDefaultApiFormats(),
     rate_multipliers: {},
     internal_priority: 10,
     rpm_limit: undefined,
@@ -573,7 +622,7 @@ function loadKeyData() {
     auth_type: props.editingKey.auth_type === 'service_account' ? 'service_account' : 'api_key',
     auth_config_text: '',  // auth_config 不返回给前端，编辑时需要重新输入
     api_formats: props.editingKey.api_formats?.length > 0
-      ? [...props.editingKey.api_formats]
+      ? filterAvailableApiFormats(props.editingKey.api_formats)
       : [],  // 编辑模式下保持原有选择，不默认全选
     rate_multipliers: { ...(props.editingKey.rate_multipliers || {}) },
     internal_priority: props.editingKey.internal_priority ?? 10,

frontend/src/features/providers/components/ProviderDetailDrawer.vue

@@ -936,7 +936,7 @@
     :editing-key="editingKey"
     :provider-id="provider ? provider.id : null"
     :provider-type="provider?.provider_type || null"
-    :available-api-formats="provider?.api_formats || []"
+    :available-api-formats="availableKeyApiFormats"
     @close="keyFormDialogOpen = false"
     @saved="handleKeyChanged"
   />
@@ -1258,6 +1258,65 @@ const allKeys = computed(() => {
   return result
 })
 
+const availableKeyApiFormats = computed(() => {
+  const formatSet = new Set<string>()
+
+  for (const format of provider.value?.api_formats || []) {
+    if (format) {
+      formatSet.add(format)
+    }
+  }
+
+  for (const endpoint of endpoints.value) {
+    if (endpoint.api_format) {
+      formatSet.add(endpoint.api_format)
+    }
+  }
+
+  return sortApiFormats([...formatSet])
+})
+
+function syncCurrentSelections(
+  nextEndpoints: ProviderEndpointWithKeys[] = endpoints.value,
+  nextProviderKeys: EndpointAPIKey[] = providerKeys.value
+) {
+  if (currentEndpoint.value) {
+    currentEndpoint.value = nextEndpoints.find(endpoint => endpoint.id === currentEndpoint.value?.id) ?? null
+  }
+
+  if (!editingKey.value) {
+    return
+  }
+
+  const latestKeys: EndpointAPIKey[] = []
+  const seenKeyIds = new Set<string>()
+
+  for (const key of nextProviderKeys) {
+    if (!seenKeyIds.has(key.id)) {
+      seenKeyIds.add(key.id)
+      latestKeys.push(key)
+    }
+  }
+
+  for (const endpoint of nextEndpoints) {
+    for (const key of endpoint.keys || []) {
+      if (!seenKeyIds.has(key.id)) {
+        seenKeyIds.add(key.id)
+        latestKeys.push(key)
+      }
+    }
+  }
+
+  const latestEditingKey = latestKeys.find(key => key.id === editingKey.value?.id) || null
+  editingKey.value = latestEditingKey
+
+  if (!latestEditingKey) {
+    keyFormDialogOpen.value = false
+    keyPermissionsDialogOpen.value = false
+    oauthKeyEditDialogOpen.value = false
+  }
+}
+
 // ===== 账号列表智能分页 =====
 const keysListRef = ref<HTMLElement | null>(null)
 const {
@@ -1558,6 +1617,7 @@ async function handleRefreshOAuth(key: EndpointAPIKey) {
       const freshKeys = await getProviderKeys(props.providerId).catch(() => null)
       if (freshKeys) {
         providerKeys.value = freshKeys
+        syncCurrentSelections(endpoints.value, freshKeys)
       }
     }
     // Antigravity：token 刷新后可能完成了账号激活，触发配额获取
@@ -2640,7 +2700,7 @@ async function loadEndpoints() {
     providerKeys.value = providerKeysResult
     providerModels.value = modelsResult
     // 按 API 格式排序
-    endpoints.value = endpointsList.sort((a, b) => {
+    const sortedEndpoints = endpointsList.sort((a, b) => {
       const aIdx = API_FORMAT_ORDER.indexOf(a.api_format)
       const bIdx = API_FORMAT_ORDER.indexOf(b.api_format)
       if (aIdx === -1 && bIdx === -1) return 0
@@ -2648,6 +2708,8 @@ async function loadEndpoints() {
       if (bIdx === -1) return -1
       return aIdx - bIdx
     })
+    endpoints.value = sortedEndpoints
+    syncCurrentSelections(sortedEndpoints, providerKeysResult)
   } catch (err: unknown) {
     if (requestId !== endpointsLoadRequestId) return
     showError(parseApiError(err, '加载端点失败'), '错误')