chore(http): remove subscription stream listing

[yordis]

• Persistent subscription stream listings already have a gRPC management path, so retaining the HTTP read route keeps duplicate management surface area alive without preserving unique capability.

[cursor]

PR Summary

Medium Risk
Removes the GET /subscriptions/{stream} HTTP route, which is a breaking change for any clients depending on per-stream subscription listing; core logic is otherwise unchanged.

Overview
Removes the per-stream persistent subscription listing HTTP endpoint (GET /subscriptions/{stream}) from PersistentSubscriptionController, leaving only GET /subscriptions (and /info for a specific group) for read access.

Updates test coverage and API surface accordingly: deletes HTTP long-running tests targeting the removed route, adjusts HTTP authorization expectations, prunes the route from swagger.yaml, and adds a gRPC test asserting List on a missing stream returns NotFound.

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