M2: German CSV importer + reconciliation of all 4 fixtures

- German-dialect scalar parsers in Core (GermanNumber/Money/Date, ValueCell):
  decimal comma, thousands dot, unit suffixes, € currency, both date shapes.
- Declarative MappingProfile + RowClassifier (skip summary/blank/all-zero rows) +
  CsvImporter (CsvHelper) staging readings/events/manual-costs, with auto swap
  detection on register decreases and month-end anchoring for interleaved oil dates.
- Four built-in ReferenceProfiles (Strom/Wasser/Heizöl/Kosten).
- ImportService: commit as revertible import_batch + wholesale consumption recompute
  per affected meter (NormalizationService/MeterConfigFactory), revert by batch.
- Reconciliation tests: all 4 CSVs match the sheet's own columns within tolerance
  (electricity 5 meters + Netz Einsparung, water swap→12, oil tank incl. deliveries +
  burner hours, cost category totals). Commit/revert round-trip verified on Timescale.

69 tests green (53 Core + 16 integration).

Known follow-up (polish): historical imports can contend with the 30-day compression
policy's background job; tests pause it. Consider retry-on-deadlock or deferred
compression for large historical imports in production.

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

src/Infrastructure/DependencyInjection.cs

@@ -1,3 +1,6 @@
+using MeterVault.Core.Normalization;
+using MeterVault.Infrastructure.Import;
+using MeterVault.Infrastructure.Normalization;
 using MeterVault.Infrastructure.Persistence;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.DependencyInjection;
@@ -17,6 +20,11 @@ public static class DependencyInjection
                     npgsql.MigrationsAssembly(typeof(MeterVaultDbContext).Assembly.FullName))
                 .UseSnakeCaseNamingConvention());
 
+        services.AddSingleton<INormalizationEngine>(_ => NormalizationEngine.CreateDefault());
+        services.AddScoped<NormalizationService>();
+        services.AddScoped<CsvImporter>();
+        services.AddScoped<ImportService>();
+
         return services;
     }
 }