Enhance Logging Documentation with Default Values and Examples

[mavci42]

## Problem
The "Logging" section explains LOG_LEVEL and LOG_FORMAT but does not:

1. Mention the default values for these variables.
2. Provide examples of how to set them in a .env file or during runtime.

This lack of information may confuse new developers who are integrating logging functionality.

Additionally, the list of possible values for LOG_LEVEL and LOG_FORMAT is missing. Adding a table with these details would make the documentation clearer.

## Solution

• Add a table or list with default values for LOG_LEVEL and LOG_FORMAT. For example:

  Variable	Possible Values	Default Value
  LOG_LEVEL	DEBUG, INFO, WARN, ERROR, OFF	INFO
  LOG_FORMAT	PRETTY, JSON	JSON

• Provide examples of how to set these variables in a .env file or inline during runtime, for example:

  LOG_LEVEL=DEBUG LOG_FORMAT=PRETTY yarn start
  

## Nice to Have
-Warnings for invalid LOG_LEVEL or LOG_FORMAT values ​​would be very useful.
-Add a show-log-config command to display the current logging configuration for easier debugging.