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/src/ZB.MOM.WW.Health.EntityFrameworkCore/ZB.MOM.WW.Health.EntityFrameworkCore.csproj

@@ -0,0 +1,20 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <IsPackable>true</IsPackable>
+    <PackageId>ZB.MOM.WW.Health.EntityFrameworkCore</PackageId>
+    <Authors>ZB.MOM.WW</Authors>
+    <Description>Entity Framework Core health-check extensions for the ZB.MOM.WW SCADA family.</Description>
+    <PackageProjectUrl>https://gitea.dohertylan.com/dohertj2/zb-mom-ww-health</PackageProjectUrl>
+    <RepositoryUrl>https://gitea.dohertylan.com/dohertj2/zb-mom-ww-health</RepositoryUrl>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\ZB.MOM.WW.Health\ZB.MOM.WW.Health.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.EntityFrameworkCore" />
+  </ItemGroup>
+
+</Project>