fix(chat): remove redundant build() call in ToolCallingChatOptions

Author: Yuriy Bezsonov

apps/java-spring-ai-agents/aiagent/src/main/java/com/example/agent/ChatService.java

@@ -207,7 +207,7 @@ private Flux<String> processDocument(String prompt, String fileBase64, String fi
         String userPrompt = (prompt != null && !prompt.trim().isEmpty()) ? prompt : "Analyze this document";
 
         return documentClient.prompt()
-            .options(ToolCallingChatOptions.builder().model(documentModel).build())
+            .options(ToolCallingChatOptions.builder().model(documentModel))
             .user(userSpec -> {
                 userSpec.text(userPrompt);
                 userSpec.media(mimeType, resource);