[Justin Hammond (Justintime50)]

Description

Exposes the new EU regulatory fields in the Node typings for DOCS-947 and bumps the version to v9.1.0.

• Adds manufacturer_product_id (NS-PID) and standardized_product_id (S-PID such as a GTIN/EAN) declares to the CustomsItem model and to CustomsItemCreateParameters, and types the customs_items nested in CustomsInfoCreateParameters as CustomsItemCreateParameters | CustomsItem. CustomsInfo.customs_items on the model is now typed as CustomsItem[].
• Adds address to the shipment ShipmentTaxIdentifier create params, typed as AddressCreateParameters | Address (inline fields or an { id: 'adr_...' } reference; the API rejects a bare string).
• Adds a TaxIdentifier model (entity, tax_id, tax_id_type, issuing_country, address) following the Surcharge precedent, and declares tax_identifiers on the Shipment model, matching the C#, Go and Java models.
• Shipment options is already Record<string, unknown>-loose, so UPS carrier_options.shipper_type/consignee_type already passes through.
• Comment-only cleanup in src/services/shipment_service.ts: removes a stray static async createAndBuyLuma(params: ShipmentCreateParameters): Promise<unknown> { line that a bad merge in TSM-06: convert Group A services to TypeScript #563 left inside the JSDoc above create(), and restores the original Create a {@link Shipment shipment}. summary it replaced. No code changes.
• Bumps the version to 9.1.0 in package.json and the two top-level version fields of package-lock.json (no dependency changes), and adds the CHANGELOG entry.

Testing

No new tests or cassettes. This only adds model and parameter typings and changes a comment. tsc -p tsconfig.build.json --noEmit, eslint and prettier --check on the changed files pass locally. CI covers the rest.

Pull Request Type

Please select the option(s) that are relevant to this PR.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Improvement (fixing a typo, updating readme, renaming a variable name, etc)