SRM Refactor: Add an internal catalog endpoint to list service specifications filtered by app provider id.

Paris Stentoumisrequested to merge
refactor/list-svc-spec-by-provider into refactor/tf-sdk-ports

Summary

Add an internal catalog endpoint to list service specifications filtered by app provider id.

  • New use case + repository method: list_by_app_provider_id
  • GET /catalog/service-specifications?app_provider_id=... on the internal router
  • Tests for REST catalog, repository, and in-memory fake

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