feat: dashboard use ip instead of localhost

[leaf-potato]

• issue: https://github.com/GreptimeTeam/gtctl/issues/211
• summary: dashboard link log use ip instead of localhost

Summary by CodeRabbit

• New Features

  • Enhanced logging functionality with a new method for accessing the dashboard.
  • Introduced a new utility function to dynamically retrieve the machine's IP address.

• Improvements

  • Increased visibility of the Frontend struct, making it accessible from other packages.
  • Improved API usability by aligning method signatures with the new exported struct definition.

• Refactor

  • Adjusted the type of the Frontend component for more specialized functionality within the cluster architecture.