feat(设置): 添加 CCH 服务地址配置功能

- 新增服务地址输入框，支持自定义 CCH 服务 URL
- 服务地址与 API Key 一起保存到用户设置
- 页面加载时自动填充已保存的服务地址

src/app/settings/page.tsx

@@ -50,6 +50,7 @@ export default function SettingsPage() {
   const { tools, loading: toolsLoading } = useTools();
 
   // CCH 配置状态
+  const [cchUrl, setCchUrl] = useState('');
   const [cchApiKey, setCchApiKey] = useState('');
   const [showApiKey, setShowApiKey] = useState(false);
   const [saveStatus, setSaveStatus] = useState<'idle' | 'saving' | 'saved' | 'error'>('idle');
@@ -68,6 +69,7 @@ export default function SettingsPage() {
   // 当设置加载完成后，更新本地状态
   useEffect(() => {
     if (settings) {
+      setCchUrl(settings.cchUrl || '');
       setSystemPrompt(settings.systemPrompt || '');
       setTemperature(settings.temperature || '0.7');
     }
@@ -77,8 +79,12 @@ export default function SettingsPage() {
   const handleSaveCchConfig = async () => {
     setSaveStatus('saving');
     try {
-      if (cchApiKey) {
+      const updates: Record<string, string> = {};
-        await updateSettings({ cchApiKey });
+      if (cchUrl) updates.cchUrl = cchUrl;
+      if (cchApiKey) updates.cchApiKey = cchApiKey;
+
+      if (Object.keys(updates).length > 0) {
+        await updateSettings(updates);
       }
       setSaveStatus('saved');
       setCchApiKey(''); // 清除输入的 API Key
@@ -313,6 +319,20 @@ export default function SettingsPage() {
           title="CCH 服务配置"
           description="配置 Claude Code Hub 服务连接"
         >
+              {/* 服务地址配置 */}
+              <SettingsItem
+                label="服务地址"
+                description="配置 CCH 服务的访问地址"
+              >
+                <input
+                  type="text"
+                  className="settings-input w-80"
+                  value={cchUrl}
+                  onChange={(e) => setCchUrl(e.target.value)}
+                  placeholder="https://claude.leocoder.cn/"
+                />
+              </SettingsItem>
+
               <SettingsItem
                 label="API Key"
                 description={