feat(lmxproxy): phase 7 — integration tests, deployment to windev, v1 cutover

- Replaced STA dispatch thread with Task.Run pattern for COM interop
- Fixed TypedValue oneof tracking with property-level _setCase field
- Added x-api-key DelegatingHandler for gRPC metadata authentication
- Fixed CheckApiKey RPC to validate request body key (not header)
- Integration tests: 15/17 pass (reads, subscribes, API keys, connections)
- 2 write tests pending (OnWriteComplete callback timing issue)
- v2 service deployed on windev port 50100

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lmxproxy/src/ZB.MOM.WW.LmxProxy.Host/LmxProxyService.cs

@@ -127,7 +127,7 @@ namespace ZB.MOM.WW.LmxProxy.Host
 
                 // 13. Create gRPC service
                 var grpcService = new ScadaGrpcService(
-                    _mxAccessClient, _sessionManager, _subscriptionManager, _performanceMetrics);
+                    _mxAccessClient, _sessionManager, _subscriptionManager, _performanceMetrics, _apiKeyService);
 
                 // 14. Create and configure interceptor
                 var interceptor = new ApiKeyInterceptor(_apiKeyService);