chore(clients/dotnet): bump Contracts + Client 0.2.1 -> 0.3.0 for publish (#214)

0.2.1 on the feed predates the 488649c AcknowledgeAlarmRequest
operator_password/operator_domain fields; 0.3.0 ships them so OtOpcUa can
adopt operator-authenticated alarm ack (lmxopcua#749).

clients/dotnet/README.md

@@ -554,7 +554,7 @@ dotnet nuget add source https://gitea.dohertylan.com/api/packages/dohertj2/nuget
 Then add the package to your project:
 
 ````bash
-dotnet add package ZB.MOM.WW.MxGateway.Client --version 0.2.0
+dotnet add package ZB.MOM.WW.MxGateway.Client --version 0.3.0
 ````
 
 The `ZB.MOM.WW.MxGateway.Contracts` package is pulled in transitively.

clients/dotnet/ZB.MOM.WW.MxGateway.Client/ZB.MOM.WW.MxGateway.Client.csproj

@@ -19,7 +19,7 @@
   <PropertyGroup>
     <IsPackable>true</IsPackable>
     <PackageId>ZB.MOM.WW.MxGateway.Client</PackageId>
-    <Version>0.2.1</Version>
+    <Version>0.3.0</Version>
     <Description>.NET 10 gRPC client for the MxAccessGateway service. Provides typed wrappers, retry, and a lazy-browse walker over the Galaxy Repository hierarchy.</Description>
     <PackageReadmeFile>README.md</PackageReadmeFile>
     <!-- Only the shipped library generates XML docs (matching src/Contracts). The Cli and