fix: return Failure envelope when SSRF blocks AI chat URL at runtime

Wrap configure() call in AiChatModelServiceImpl.sendChatRequestAsync
so a synchronous exception (e.g. runtime SSRF block) is converted to
a failed future and caught by the controller's .catching() chain,
returning TbChatResponse.Failure instead of a raw 500.

application/src/main/java/org/thingsboard/server/service/ai/AiChatModelServiceImpl.java

@@ -17,6 +17,7 @@ package org.thingsboard.server.service.ai;
 
 import com.fasterxml.jackson.core.io.JsonStringEncoder;
 import com.google.common.util.concurrent.FluentFuture;
+import com.google.common.util.concurrent.Futures;
 import dev.langchain4j.data.message.ChatMessage;
 import dev.langchain4j.data.message.Content;
 import dev.langchain4j.data.message.TextContent;
@@ -42,7 +43,12 @@ class AiChatModelServiceImpl implements AiChatModelService {
 
     @Override
     public <C extends AiChatModelConfig<C>> FluentFuture<ChatResponse> sendChatRequestAsync(AiChatModelConfig<C> chatModelConfig, ChatRequest chatRequest) {
-        ChatModel langChainChatModel = chatModelConfig.configure(chatModelConfigurer);
+        ChatModel langChainChatModel;
+        try {
+            langChainChatModel = chatModelConfig.configure(chatModelConfigurer);
+        } catch (Throwable t) {
+            return FluentFuture.from(Futures.immediateFailedFuture(t));
+        }
         if (langChainChatModel.provider() == ModelProvider.GITHUB_MODELS) {
             chatRequest = prepareGithubChatRequest(chatRequest);
         }

application/src/test/java/org/thingsboard/server/controller/AiModelControllerTest.java

@@ -22,6 +22,10 @@ import org.springframework.test.web.servlet.ResultActions;
 import org.thingsboard.common.util.SsrfProtectionValidator;
 import org.thingsboard.server.common.data.EntityType;
 import org.thingsboard.server.common.data.ai.AiModel;
+import org.thingsboard.server.common.data.ai.dto.TbChatRequest;
+import org.thingsboard.server.common.data.ai.dto.TbChatResponse;
+import org.thingsboard.server.common.data.ai.dto.TbContent;
+import org.thingsboard.server.common.data.ai.dto.TbUserMessage;
 import org.thingsboard.server.common.data.ai.model.chat.AnthropicChatModelConfig;
 import org.thingsboard.server.common.data.ai.model.chat.GoogleAiGeminiChatModelConfig;
 import org.thingsboard.server.common.data.ai.model.chat.OpenAiChatModelConfig;
@@ -35,6 +39,8 @@ import org.thingsboard.server.common.data.page.PageLink;
 import org.thingsboard.server.common.data.page.SortOrder;
 import org.thingsboard.server.dao.service.DaoSqlTest;
 
+import java.util.List;
+
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.is;
@@ -168,6 +174,37 @@ public class AiModelControllerTest extends AbstractControllerTest {
         }
     }
 
+    @Test
+    public void sendChatRequest_whenBaseUrlBlockedAtRuntime_shouldReturnFailureEnvelope() throws Exception {
+        // GIVEN
+        loginTenantAdmin();
+        SsrfProtectionValidator.setEnabled(true);
+
+        try {
+            var modelConfig = OpenAiChatModelConfig.builder()
+                    .providerConfig(OpenAiProviderConfig.builder()
+                            .baseUrl("http://10.0.0.1:8080/")
+                            .apiKey("test-api-key")
+                            .build())
+                    .modelId("gpt-4o")
+                    .build();
+
+            var chatRequest = new TbChatRequest(
+                    null,
+                    new TbUserMessage(List.of(new TbContent.TbTextContent("hi"))),
+                    modelConfig);
+
+            // WHEN
+            TbChatResponse response = doPost("/api/ai/chat", chatRequest, TbChatResponse.class);
+
+            // THEN
+            assertThat(response).isInstanceOf(TbChatResponse.Failure.class);
+            assertThat(((TbChatResponse.Failure) response).errorDetails()).contains("URI is invalid");
+        } finally {
+            SsrfProtectionValidator.setEnabled(false);
+        }
+    }
+
     /* --- Get by ID API tests --- */
 
     @Test