fix: add opt-in appendAutoPrefix for directory auto prefixes

[SergioChan]

Summary

• add a new appendAutoPrefix autoload option (default false)
• keep existing behavior by default (plugin.autoPrefix still overrides directory-derived prefixes)
• when appendAutoPrefix: true, concatenate directory prefix + plugin.autoPrefix
• add Issue autoPrefix overwrites directory path set by dirNameRoutePrefix #205 coverage to verify both default and opt-in behaviors
• document the new option and update TypeScript definitions

Issue

Closes #205

Validation

• node --test test/issues/205/test.js
• node --test test/commonjs/basic.js

[mcollina]

it's totally unclear what this does from looking at this statement

[SergioChan]

Thanks — addressed in commit c5cf899.

I rewrote this section to explicitly describe both modes (�ppendAutoPrefix: false vs rue) and included concrete resulting route paths so the behavior is easier to understand at a glance.

[mcollina]

This example is not clear

[SergioChan]

Good call — updated in commit c5cf899.

The README example now uses a concrete directory + �utoPrefix setup and shows the exact resulting paths for both default mode and append mode.

[SergioChan]

Thanks for the review — I pushed an update to clarify the behavior and example in README.

What changed:

• Rewrote the appendAutoPrefix section to explicitly describe both modes (false vs true).
• Added a concrete directory example showing routes/children/new-routes.js exporting autoPrefix = '/batch'.
• Added explicit resulting route paths for both modes:
  • default: /your-parent-prefix/batch/entity
  • append mode: /your-parent-prefix/children/batch/entity

Validation:

• node --test test/issues/205/test.js

If you want, I can also add a short one-line cross-reference from dirNameRoutePrefix to appendAutoPrefix for discoverability.