chore(ui): hide stream check / model test config panels

The stream check feature is unreliable due to diverse provider request
formats. Comment out the model test config UI in settings page, provider
advanced config, and the test button in provider actions. Backend code
and i18n keys are preserved for future restoration.

src/components/providers/forms/ProviderAdvancedConfig.tsx

@@ -3,7 +3,7 @@ import { useState, useEffect } from "react";
 import {
   ChevronDown,
   ChevronRight,
-  FlaskConical,
+  // FlaskConical, // Hidden: stream check feature disabled
   Globe,
   Coins,
   Eye,
@@ -87,15 +87,16 @@ function parseProxyUrl(url: string): Partial<ProviderProxyConfig> {
 }
 
 export function ProviderAdvancedConfig({
-  testConfig,
+  testConfig: _testConfig, // Hidden: stream check feature disabled
   proxyConfig,
   pricingConfig,
-  onTestConfigChange,
+  onTestConfigChange: _onTestConfigChange, // Hidden: stream check feature disabled
   onProxyConfigChange,
   onPricingConfigChange,
 }: ProviderAdvancedConfigProps) {
   const { t } = useTranslation();
-  const [isTestConfigOpen, setIsTestConfigOpen] = useState(testConfig.enabled);
+  // Hidden: stream check feature disabled
+  // const [isTestConfigOpen, setIsTestConfigOpen] = useState(testConfig.enabled);
   const [isProxyConfigOpen, setIsProxyConfigOpen] = useState(
     proxyConfig.enabled,
   );
@@ -110,10 +111,10 @@ export function ProviderAdvancedConfig({
   // 标记是否为用户主动输入（用于区分外部更新和用户输入）
   const [isUserTyping, setIsUserTyping] = useState(false);
 
-  // 同步外部 testConfig.enabled 变化到展开状态
-  useEffect(() => {
-    setIsTestConfigOpen(testConfig.enabled);
-  }, [testConfig.enabled]);
+  // Hidden: stream check feature disabled
+  // useEffect(() => {
+  //   setIsTestConfigOpen(testConfig.enabled);
+  // }, [testConfig.enabled]);
 
   // 同步外部 proxyConfig.enabled 变化到展开状态
   useEffect(() => {
@@ -167,7 +168,7 @@ export function ProviderAdvancedConfig({
 
   return (
     <div className="space-y-4">
-      {/* 模型测试配置 */}
+      {/* Hidden: stream check feature disabled — model test config panel
       <div className="rounded-lg border border-border/50 bg-muted/20">
         <button
           type="button"
@@ -343,6 +344,7 @@ export function ProviderAdvancedConfig({
           </div>
         </div>
       </div>
+      */}
 
       {/* 代理配置 */}
       <div className="rounded-lg border border-border/50 bg-muted/20">