Resolve all 46 low-severity architecture review findings

src/ZB.MOM.WW.ScadaBridge.InboundAPI/HttpStandbyRequestForwarder.cs

@@ -28,7 +28,7 @@ namespace ZB.MOM.WW.ScadaBridge.InboundAPI;
 /// active (a transient during failover) bounces at most one hop, never ping-pongs.</para>
 ///
 /// <para><b>Fidelity.</b> Method, path, query string, body and headers are relayed
-/// verbatim (hop-by-hop headers and <c>Host</c> excepted), so the active node
+/// verbatim (hop-by-hop headers, <c>Host</c> and <c>Accept-Encoding</c> excepted), so the active node
 /// authenticates the caller's own <c>Authorization</c>/<c>X-API-Key</c> credential and
 /// applies its own body cap and method timeout. The active node's status, content type
 /// and body are replayed to the caller unchanged. The body is buffered once on the
@@ -61,6 +61,8 @@ public sealed class HttpStandbyRequestForwarder : IStandbyRequestForwarder
     {
         "Host", "Content-Length", "Transfer-Encoding", "Connection", "Keep-Alive",
         "Proxy-Connection", "Upgrade", "TE", "Trailer", "Expect",
+        // The relay copies raw response bytes and Content-Type, not Content-Encoding.
+        "Accept-Encoding",
     };
 
     private readonly IHttpClientFactory _httpClientFactory;