MPT-16255 Seeding for catalog

[albertsola]

Summary by CodeRabbit

• New Features

  • Added catalog authorization, listing, price list, and expanded product creation/seeding flows.

• Bug Fixes

  • Improved dependency injection wiring for more reliable initialization.

• Refactor

  • Simplified seeding orchestration and container wiring; removed legacy item/item-group seeding flows.

• Tests

  • Added and updated unit tests to cover new seeding helpers and authorization/listing/price-list flows.

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