refactor(BA-5961): introduce `AppProxyClientRegistry` for app-proxy domain clients#11491

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refactor/BA-5961-app-proxy-client-registry

Commits on May 6, 2026

refactor(BA-5961): introduce AppProxyClientRegistry for app-proxy domain clients

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chore(BA-5961): add news fragment for app-proxy registry refactor

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chore(BA-5961): trim news fragment and switch type to enhance

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chore(BA-5961): add concise news fragment

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chore(BA-5961): tighten news fragment to one sentence

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test(BA-5961): add unit tests for AppProxyClientRegistry

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refactor(BA-5961): trim BackendAIAppProxyClient docstring

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refactor(BA-5961): broaden BackendAIAppProxyClient docstring

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