refactor(mcp): share protected resource metadata discovery - #3955
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Extract the duplicated RFC 9728 protected-resource-metadata fetch/decode logic from the managed and unmanaged OAuth flows into a single fetchProtectedResourceMetadata helper, keeping the existing supplied-origin-default and 404-tolerant behavior. The helper accepts optional fallback candidate URLs for the standalone CLI discovery flow without changing runtime callers.
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Stacked on #3881.
Extracts duplicated RFC 9728 protected-resource metadata fetch/decode/defaulting from managed and docker-agent-driven unmanaged OAuth into a shared helper. Runtime fallback remains disabled, while explicit ordered fallback support is enabled for forthcoming standalone CLI work.
Adds deterministic local tests covering exact candidates/GET/order, hard stops (invalid JSON and non-200 responses including 204), 404 exhaustion, metadata preservation, and no downstream OAuth activity after hard errors. Clarifies the RequestedScopes comment.