M0: scaffold solution, EF+Timescale schema, /healthz

Five-project Clean Architecture solution (Core/Infrastructure/App + Core.Tests/
Integration.Tests) on .NET 10 with central package management, snake_case EF mapping,
and shared build/style config.

- Full domain entity set + EF DbContext for the SDD §5.3 schema (singular table names).
- InitialSchema migration (relational) + TimescaleHypertables migration (raw SQL:
  create_hypertable + compression on reading, hypertable on consumption).
- App wiring: Serilog (actually wired, unlike MQTTower), DbContext, migrate-on-startup,
  /healthz. Serves plain HTTP behind a reverse proxy (no HTTPS redirect).
- deploy/Dockerfile (2-stage, ICU-capable) + docker-compose (app + timescaledb).
- Integration.Tests: shared TimescaleFixture (Testcontainers) — migrations, hypertables,
  compression policy, and /healthz all verified green (4/4).

Claude-Session: https://claude.ai/code/session_01WujdMtMJPbxDpDnMeK22rr

Directory.Packages.props

@@ -0,0 +1,37 @@
+<Project>
+
+  <PropertyGroup>
+    <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
+    <CentralPackageTransitivePinningEnabled>true</CentralPackageTransitivePinningEnabled>
+  </PropertyGroup>
+
+  <ItemGroup Label="Data / infrastructure">
+    <PackageVersion Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="10.0.3" />
+    <PackageVersion Include="Microsoft.EntityFrameworkCore.Design" Version="10.0.9" />
+    <PackageVersion Include="Microsoft.EntityFrameworkCore.Relational" Version="10.0.9" />
+    <PackageVersion Include="EFCore.NamingConventions" Version="10.0.1" />
+    <PackageVersion Include="Dapper" Version="2.1.79" />
+    <PackageVersion Include="CsvHelper" Version="33.1.0" />
+    <PackageVersion Include="MQTTnet" Version="5.2.0.1603" />
+    <PackageVersion Include="Microsoft.Extensions.Http" Version="10.0.9" />
+  </ItemGroup>
+
+  <ItemGroup Label="App / UI">
+    <PackageVersion Include="MudBlazor" Version="9.7.0" />
+    <PackageVersion Include="Blazor-ApexCharts" Version="6.1.0" />
+    <PackageVersion Include="Serilog.AspNetCore" Version="10.0.0" />
+    <PackageVersion Include="Serilog.Sinks.Console" Version="6.1.1" />
+    <PackageVersion Include="Swashbuckle.AspNetCore" Version="10.2.3" />
+  </ItemGroup>
+
+  <ItemGroup Label="Tests">
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageVersion Include="xunit" Version="2.9.3" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.4" />
+    <PackageVersion Include="coverlet.collector" Version="6.0.4" />
+    <PackageVersion Include="Testcontainers.PostgreSql" Version="4.13.0" />
+    <PackageVersion Include="Respawn" Version="7.0.0" />
+    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.9" />
+  </ItemGroup>
+
+</Project>