feat(health): scaffold ZB.MOM.WW.Health solution + Task 4 (tags + three-tier MapZbHealth)

Consolidates the library into the scadaproj repo (matching the ZB.MOM.WW.Auth
convention — tracked in-parent, not a nested repo). 3 dependency-split packages
(core / .Akka / .EntityFrameworkCore) + 3 test projects, .slnx, central PM.
Task 4: ZbHealthTags + MapZbHealth (/health/ready,/active,/healthz). 8/8 tests.

ZB.MOM.WW.Health/tests/ZB.MOM.WW.Health.EntityFrameworkCore.Tests/ZB.MOM.WW.Health.EntityFrameworkCore.Tests.csproj

@@ -0,0 +1,24 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" />
+    <PackageReference Include="xunit" />
+    <PackageReference Include="xunit.runner.visualstudio" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Xunit" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\ZB.MOM.WW.Health.EntityFrameworkCore\ZB.MOM.WW.Health.EntityFrameworkCore.csproj" />
+  </ItemGroup>
+
+</Project>