docs: Add comprehensive JSDoc documentation to Logger class

[continue]

Changes

This PR adds comprehensive JSDoc documentation to the Logger class and all related functions in src/helpers/logger.ts.

What was added:

• LogLevel enum: Documented each log level (DEBUG, INFO, WARN, ERROR) with descriptions
• Logger class: Added class-level JSDoc documentation
• Constructor: Documented parameters with default values and usage example
• Private methods:
  • formatMessage: Documents message formatting logic
  • shouldLog: Documents log level checking logic
• Public logging methods:
  • debug: With usage example
  • info: With usage example
  • warn: With usage example
  • error: With usage example and Error parameter documentation
• Getter/Setter methods:
  • setLevel: With usage example
  • getLevel: With return type documentation
• Helper functions:
  • createLogger: Factory function with usage example
  • parseLogLevel: String parser with examples
  • formatError: Error formatter with try/catch example

All documentation includes:

• Parameter types and descriptions
• Return types
• Usage examples where appropriate
• Clear explanations of what each method does

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