refactor: 移除 Provider/Endpoint 级别的 timeout 配置，改用全局环境变量

- 废弃 Provider.timeout 和 ProviderEndpoint.timeout 字段（保留数据库列以兼容）
- 非流式请求超时由 HTTP_REQUEST_TIMEOUT 环境变量控制（默认 300 秒）
- 流式请求首字节超时由 STREAM_FIRST_BYTE_TIMEOUT 环境变量控制（默认 30 秒）
- 移除前端表单中的超时配置输入框
- 简化 settings.py 中的 TTFB 超时解析逻辑
- 更新 API 请求/响应模型，移除 timeout 字段
- 更新导入导出功能，不再包含 timeout 配置

frontend/src/api/admin.ts

@@ -76,7 +76,6 @@ export interface ProviderExport {
   provider_priority?: number
   is_active: boolean
   concurrent_limit?: number | null
-  timeout?: number | null
   max_retries?: number | null
   proxy?: any
   config?: any
@@ -89,7 +88,6 @@ export interface EndpointExport {
   api_format: string
   base_url: string
   headers?: any
-  timeout?: number
   max_retries?: number
   is_active: boolean
   custom_path?: string | null

frontend/src/api/endpoints/endpoints.ts

@@ -28,7 +28,6 @@ export async function createEndpoint(
     base_url: string
     custom_path?: string
     header_rules?: HeaderRule[]
-    timeout?: number
     max_retries?: number
     is_active?: boolean
     config?: Record<string, any>
@@ -48,7 +47,6 @@ export async function updateEndpoint(
     base_url: string
     custom_path: string | null
     header_rules: HeaderRule[]
-    timeout: number
     max_retries: number
     is_active: boolean
     config: Record<string, any>

frontend/src/api/endpoints/providers.ts

@@ -34,7 +34,6 @@ export async function updateProvider(
     quota_expires_at: string
     rpm_limit: number | null
     // 请求配置（从 Endpoint 迁移）
-    timeout: number
     max_retries: number
     proxy: ProxyConfig | null
     cache_ttl_minutes: number  // 0表示不支持缓存，>0表示支持缓存并设置TTL(分钟)

frontend/src/api/endpoints/types.ts

@@ -96,7 +96,6 @@ export interface ProviderEndpoint {
   custom_path?: string  // 自定义请求路径（可选，为空则使用 API 格式默认路径）
   // 请求头配置
   header_rules?: HeaderRule[]  // 请求头规则列表，支持 set/drop/rename 操作
-  timeout: number
   max_retries: number
   is_active: boolean
   config?: Record<string, any>
@@ -302,7 +301,6 @@ export interface ProviderWithEndpointsSummary {
   quota_last_reset_at?: string  // 当前周期开始时间
   quota_expires_at?: string
   // 请求配置（从 Endpoint 迁移）
-  timeout?: number  // 请求超时（秒）
   max_retries?: number  // 最大重试次数
   proxy?: ProxyConfig | null  // 代理配置
   is_active: boolean

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

@@ -80,29 +80,16 @@
               </SelectContent>
             </Select>
           </div>
-          <div class="grid grid-cols-2 gap-4">
-            <div class="space-y-1.5">
-              <Label>超时时间 (秒)</Label>
-              <Input
-                :model-value="form.timeout ?? ''"
-                type="number"
-                min="1"
-                max="600"
-                placeholder="默认 300"
-                @update:model-value="(v) => form.timeout = parseNumberInput(v)"
-              />
-            </div>
-            <div class="space-y-1.5">
-              <Label>最大重试次数</Label>
-              <Input
-                :model-value="form.max_retries ?? ''"
-                type="number"
-                min="0"
-                max="10"
-                placeholder="默认 2"
-                @update:model-value="(v) => form.max_retries = parseNumberInput(v)"
-              />
-            </div>
+          <div class="space-y-1.5">
+            <Label>最大重试次数</Label>
+            <Input
+              :model-value="form.max_retries ?? ''"
+              type="number"
+              min="0"
+              max="10"
+              placeholder="默认 2"
+              @update:model-value="(v) => form.max_retries = parseNumberInput(v)"
+            />
           </div>
         </div>
 
@@ -279,7 +266,6 @@ const form = ref({
   rate_limit: undefined as number | undefined,
   concurrent_limit: undefined as number | undefined,
   // 请求配置
-  timeout: undefined as number | undefined,
   max_retries: undefined as number | undefined,
   // 代理配置（扁平化便于表单绑定）
   proxy_enabled: false,
@@ -304,7 +290,6 @@ function resetForm() {
     rate_limit: undefined,
     concurrent_limit: undefined,
     // 请求配置
-    timeout: undefined,
     max_retries: undefined,
     // 代理配置
     proxy_enabled: false,
@@ -335,7 +320,6 @@ function loadProviderData() {
     rate_limit: undefined,
     concurrent_limit: undefined,
     // 请求配置
-    timeout: props.provider.timeout ?? undefined,
     max_retries: props.provider.max_retries ?? undefined,
     // 代理配置
     proxy_enabled: proxy?.enabled ?? false,
@@ -391,7 +375,6 @@ const handleSubmit = async () => {
       provider_priority: form.value.provider_priority,
       is_active: form.value.is_active,
       // 请求配置
-      timeout: form.value.timeout ?? undefined,
       max_retries: form.value.max_retries ?? undefined,
       proxy,
     }

frontend/src/mocks/handler.ts

@@ -425,9 +425,9 @@ const MOCK_ENDPOINT_KEYS = [
 
 // Mock Endpoints
 const MOCK_ENDPOINTS = [
-  { id: 'ep-001', provider_id: 'provider-001', provider_name: 'anthropic', api_format: 'CLAUDE', base_url: 'https://api.anthropic.com', timeout: 300, max_retries: 2, is_active: true, total_keys: 2, active_keys: 2, created_at: '2024-01-01T00:00:00Z', updated_at: new Date().toISOString() },
-  { id: 'ep-002', provider_id: 'provider-002', provider_name: 'openai', api_format: 'OPENAI', base_url: 'https://api.openai.com', timeout: 60, max_retries: 2, is_active: true, total_keys: 1, active_keys: 1, created_at: '2024-01-01T00:00:00Z', updated_at: new Date().toISOString() },
-  { id: 'ep-003', provider_id: 'provider-003', provider_name: 'google', api_format: 'GEMINI', base_url: 'https://generativelanguage.googleapis.com', timeout: 60, max_retries: 2, is_active: true, total_keys: 1, active_keys: 1, created_at: '2024-01-15T00:00:00Z', updated_at: new Date().toISOString() }
+  { id: 'ep-001', provider_id: 'provider-001', provider_name: 'anthropic', api_format: 'CLAUDE', base_url: 'https://api.anthropic.com', max_retries: 2, is_active: true, total_keys: 2, active_keys: 2, created_at: '2024-01-01T00:00:00Z', updated_at: new Date().toISOString() },
+  { id: 'ep-002', provider_id: 'provider-002', provider_name: 'openai', api_format: 'OPENAI', base_url: 'https://api.openai.com', max_retries: 2, is_active: true, total_keys: 1, active_keys: 1, created_at: '2024-01-01T00:00:00Z', updated_at: new Date().toISOString() },
+  { id: 'ep-003', provider_id: 'provider-003', provider_name: 'google', api_format: 'GEMINI', base_url: 'https://generativelanguage.googleapis.com', max_retries: 2, is_active: true, total_keys: 1, active_keys: 1, created_at: '2024-01-15T00:00:00Z', updated_at: new Date().toISOString() }
 ]
 
 // Mock 能力定义
@@ -1221,7 +1221,6 @@ function generateMockEndpointsForProvider(providerId: string) {
       base_url: format.includes('CLAUDE') ? 'https://api.anthropic.com' :
                 format.includes('OPENAI') ? 'https://api.openai.com' :
                 'https://generativelanguage.googleapis.com',
-      timeout: 300,
       max_retries: 2,
       is_active: healthDetail?.is_active ?? true,
       total_keys: Math.ceil(Math.random() * 3) + 1,