fix: update SiliconFlow default endpoint to .cn (#543)

SiliconFlow is transitioning from .com to .cn domain. The .cn endpoint
uses Global Traffic Manager (GTM) for better global access, while .com
is being phased out.

app/api/validate-model/route.ts

@@ -202,7 +202,7 @@ export async function POST(req: Request) {
             case "siliconflow": {
                 const sf = createOpenAI({
                     apiKey,
-                    baseURL: baseUrl || "https://api.siliconflow.com/v1",
+                    baseURL: baseUrl || "https://api.siliconflow.cn/v1",
                 })
                 model = sf.chat(modelId)
                 break

lib/ai-providers.ts

@@ -464,7 +464,7 @@ function validateProviderCredentials(provider: ProviderName): void {
  * - DEEPSEEK_API_KEY: DeepSeek API key
  * - DEEPSEEK_BASE_URL: DeepSeek endpoint (optional)
  * - SILICONFLOW_API_KEY: SiliconFlow API key
- * - SILICONFLOW_BASE_URL: SiliconFlow endpoint (optional, defaults to https://api.siliconflow.com/v1)
+ * - SILICONFLOW_BASE_URL: SiliconFlow endpoint (optional, defaults to https://api.siliconflow.cn/v1)
  * - SGLANG_API_KEY: SGLang API key
  * - SGLANG_BASE_URL: SGLang endpoint (optional)
  * - MODELSCOPE_API_KEY: ModelScope API key
@@ -721,7 +721,7 @@ export function getAIModel(overrides?: ClientOverrides): ModelConfig {
             const baseURL =
                 overrides?.baseUrl ||
                 process.env.SILICONFLOW_BASE_URL ||
-                "https://api.siliconflow.com/v1"
+                "https://api.siliconflow.cn/v1"
             const siliconflowProvider = createOpenAI({
                 apiKey,
                 baseURL,

lib/types/model-config.ts

@@ -80,7 +80,7 @@ export const PROVIDER_INFO: Record<
     deepseek: { label: "DeepSeek" },
     siliconflow: {
         label: "SiliconFlow",
-        defaultBaseUrl: "https://api.siliconflow.com/v1",
+        defaultBaseUrl: "https://api.siliconflow.cn/v1",
     },
     sglang: {
         label: "SGLang",