* MM-68976 Preserve PluginSettings.SignaturePublicKeyFiles on config patch endpoint The full PUT /api/v4/config endpoint silently preserves PluginSettings.SignaturePublicKeyFiles (added in #13682), but the sparse PUT /api/v4/config/patch endpoint had no equivalent guard, so a session with sysconsole_write_plugins could modify the field through it. Mirror the full update endpoint's behavior by silently preserving the existing value in patchConfig, and add a regression test equivalent to the one in TestUpdateConfig. * MM-68976 Document SignaturePublicKeyFiles as non-modifiable in config API spec Both the update and patch config endpoints preserve PluginSettings.SignaturePublicKeyFiles; note this in the OpenAPI descriptions alongside the existing PluginSettings.EnableUploads note.
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