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

sampledata/Energiebilanz - Kosten.csv

@@ -0,0 +1,53 @@
+Datum,Jahreskosten,Kosten,Heizung,Strom,Wasser,Pool Betrieb
+September 2022,,"0,00 €","0,00 €","0,00 €","0,00 €",
+Oktober 2022,,"66,56 €","0,00 €","66,56 €","0,00 €",
+November 2022,,"133,12 €","0,00 €","133,12 €","0,00 €",
+Dezember 2022,"421,52 €","221,84 €","0,00 €","151,84 €","70,00 €",
+Januar 2023,,"920,80 €","336,00 €","514,80 €","70,00 €",
+Februar 2023,,"785,12 €","336,00 €","384,12 €","65,00 €",
+März 2023,,"620,72 €","280,00 €","280,72 €","60,00 €",
+April 2023,,"638,48 €","280,00 €","293,48 €","65,00 €",
+Mai 2023,,"813,33 €","224,00 €","414,33 €","175,00 €",X
+Juni 2023,,"714,74 €","168,00 €","421,74 €","125,00 €",X
+Juli 2023,,"605,99 €","168,00 €","347,99 €","90,00 €",X
+August 2023,,"577,04 €","112,00 €","365,04 €","100,00 €",X
+September 2023,,"439,37 €","112,00 €","232,37 €","95,00 €",
+Oktober 2023,,"560,84 €","224,00 €","276,84 €","60,00 €",
+November 2023,,"573,52 €","224,00 €","294,52 €","55,00 €",
+Dezember 2023,"7.904,46 €","654,51 €","280,00 €","314,51 €","60,00 €",
+Januar 2024,,"818,93 €","392,00 €","356,93 €","70,00 €",
+Februar 2024,,"557,72 €","224,00 €","263,72 €","70,00 €",
+März 2024,,"610,97 €","280,00 €","245,97 €","85,00 €",
+April 2024,,"843,34 €","448,00 €","200,34 €","195,00 €",
+Mai 2024,,"446,10 €","206,67 €","164,43 €","75,00 €",
+Juni 2024,,"448,40 €","93,33 €","200,07 €","155,00 €",X
+Juli 2024,,"448,91 €","46,67 €","327,24 €","75,00 €",X
+August 2024,,"476,74 €","46,67 €","335,07 €","95,00 €",X
+September 2024,,"416,11 €","46,67 €","289,44 €","80,00 €",X
+Oktober 2024,,"439,13 €","93,33 €","280,80 €","65,00 €",
+November 2024,,"601,88 €","186,67 €","330,21 €","85,00 €",
+Dezember 2024,"6.783,05 €","674,83 €","280,00 €","304,83 €","90,00 €",
+Januar 2025,,"904,60 €","420,00 €","399,60 €","85,00 €",
+Februar 2025,,"696,92 €","280,00 €","331,92 €","85,00 €",
+März 2025,,"589,17 €","233,33 €","285,84 €","70,00 €",
+April 2025,,"400,40 €","140,00 €","185,40 €","75,00 €",
+Mai 2025,,"658,31 €","186,67 €","386,64 €","85,00 €",
+Juni 2025,,"719,60 €","140,00 €","399,60 €","180,00 €",X
+Juli 2025,,"614,03 €","46,67 €","477,36 €","90,00 €",X
+August 2025,,"723,11 €","46,67 €","586,44 €","90,00 €",X
+September 2025,,"530,09 €","93,33 €","356,76 €","80,00 €",
+Oktober 2025,,"559,71 €","46,67 €","428,04 €","85,00 €",
+November 2025,,"634,84 €","140,00 €","429,84 €","65,00 €",
+Dezember 2025,"7.907,64 €","876,87 €","326,67 €","475,20 €","75,00 €",
+Januar 2026,,"915,34 €","455,00 €","362,34 €","98,00 €",
+Februar 2026,,"673,35 €","297,27 €","271,08 €","105,00 €",
+März 2026,,"521,38 €","169,87 €","246,51 €","105,00 €",
+April 2026,,"409,90 €","84,93 €","191,97 €","133,00 €",
+Mai 2026,,"420,22 €","84,93 €","223,29 €","112,00 €",
+Juni 2026,,"0,00 €","0,00 €","0,00 €","0,00 €",
+Juli 2026,,"0,00 €","0,00 €","0,00 €","0,00 €",
+August 2026,,"0,00 €","0,00 €","0,00 €","0,00 €",
+September 2026,,"0,00 €","0,00 €","0,00 €","0,00 €",
+Oktober 2026,,"0,00 €","0,00 €","0,00 €","0,00 €",
+November 2026,,"0,00 €","0,00 €","0,00 €","0,00 €",
+Dezember 2026,"2.940,19 €","0,00 €","0,00 €","0,00 €","0,00 €",