[REFACTOR] Update logging and response message format in postContent method

src/main/java/com/safetypin/authentication/service/AuthenticationService.java

@@ -143,9 +143,9 @@ public class AuthenticationService {
         if (!user.isVerified()) {
             return "Your account is not verified. Please complete OTP verification. You may request a new OTP after 2 minutes.";
         }
-        logger.info("AuthenticationService.postContent :: Content {} posted by user with email: {}", content, email);
+        logger.info("AuthenticationService.postContent :: Content posted by user with email: {}", email);
         // For demo purposes, we assume the post is successful.
-        return "Content posted successfully";
+        return String.format("Content '%s' posted successfully.", content);
     }
 
     private int calculateAge(LocalDate birthdate) {