fix: Fix a universal OpenAI API

base/src/main/java/com/tinyengine/it/config/OpenAIConfig.java

@@ -24,7 +24,7 @@
 @Configuration
 public class OpenAIConfig {
     private String apiKey = "your-api-key";
-    private String baseUrl = "https://api.deepseek.com/chat/completions";
+    private String baseUrl = "https://api.deepseek.com";
     private String defaultModel = "deepseek-chat";
     private int timeoutSeconds = 300;
 }

base/src/main/java/com/tinyengine/it/service/app/impl/v1/AiChatV1ServiceImpl.java

@@ -58,8 +58,10 @@ public class AiChatV1ServiceImpl implements AiChatV1Service {
     public Object chatCompletion(ChatRequest request) throws Exception {
         String requestBody = buildRequestBody(request);
         String apiKey = request.getApiKey() != null ? request.getApiKey() : config.getApiKey();
+        String baseUrl = request.getBaseUrl() != null ? request.getBaseUrl() : config.getBaseUrl();
+        baseUrl = baseUrl.replaceAll("/+$", "");
         HttpRequest.Builder requestBuilder = HttpRequest.newBuilder()
-            .uri(URI.create(request.getBaseUrl() != null ? request.getBaseUrl() : config.getBaseUrl()))
+            .uri(URI.create(baseUrl).resolve("/chat/completions"))
             .header("Content-Type", "application/json")
             .header("Authorization", "Bearer " + apiKey)
             .POST(HttpRequest.BodyPublishers.ofString(requestBody));