fixed TextContent preparation for Github AI modes

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

@@ -32,7 +32,7 @@ import org.thingsboard.server.common.data.ai.model.chat.Langchain4jChatModelConf
 import java.util.List;
 import java.util.stream.Collectors;
 
-import static org.thingsboard.server.common.data.StringUtils.escapeControlChars;
+import static org.thingsboard.server.common.data.StringUtils.escapeJson;
 
 @Service
 @RequiredArgsConstructor
@@ -74,7 +74,7 @@ class AiChatModelServiceImpl implements AiChatModelService {
 
     private Content prepareContent(Content content) {
         if (content instanceof TextContent txt) {
-            return new TextContent(escapeControlChars(txt.text()));
+            return new TextContent(escapeJson(txt.text()));
         }
         return content;
     }

common/data/src/main/java/org/thingsboard/server/common/data/StringUtils.java

@@ -275,8 +275,12 @@ public class StringUtils {
         return result;
     }
 
-    public static String escapeControlChars(String text) {
+    public static String escapeJson(String text) {
         return text
+                .replace("\\", "\\\\")
+                .replace("\"", "\\\"")
+                .replace("\b", "\\b")
+                .replace("\f", "\\f")
                 .replace("\n", "\\n")
                 .replace("\r", "\\r")
                 .replace("\t", "\\t");