Improve the reliability and usability of the shipping rates import
process and update PDF document templates for better visual fidelity.
- Enhance `ImportShippingRates` command with `--clear` and `--dry-run`
options to prevent accidental data loss and allow safe testing.
- Implement error handling and statistics tracking in `ShippingRatesImport`
to capture skipped rows and import errors.
- Refactor AWB and Label PDF templates to use A4 standard dimensions
and improved CSS layouts.
- Integrate company logo into PDF headers.
- Add a new pricing inquiry page and navigation link.
- Clean up obsolete test scripts.
