chore(http): reduce duplicate subscription commands

[yordis]

• Persistent subscription deletion already has a gRPC management path, so retaining the HTTP command route keeps duplicate write surfaces alive without preserving unique capability.

[cursor]

PR Summary

Medium Risk
Medium risk because it removes an existing HTTP API route (DELETE /subscriptions/{stream}/{subscription}), which can break clients relying on that endpoint despite being a straightforward deletion of code and tests.

Overview
Removes the HTTP management surface for deleting persistent subscriptions by unregistering DELETE /subscriptions/{stream}/{subscription} and deleting its controller handler.

Updates HTTP authorization tests and the Swagger spec to no longer reference that delete route, and replaces the removed HTTP deletion tests with new gRPC management tests that validate delete success, permission-denied behavior, not-found handling, and subscriber cancellation.

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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