fix: Fix a universal OpenAI API

Author: lu-yg

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

@@ -59,8 +59,9 @@ 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(baseUrl + "/chat/completions"))
+            .uri(URI.create(baseUrl).resolve("/chat/completions"))
             .header("Content-Type", "application/json")
             .header("Authorization", "Bearer " + apiKey)
             .POST(HttpRequest.BodyPublishers.ofString(requestBody));