Admin write-CRUD, Home Assistant connector config, wiring audit

Three requested phases.

1) Admin section (SDD §8.7) — MudBlazor inline-dialog CRUD, consistent pattern,
   delete guards, snackbar feedback, shared Confirm helper:
   - Energy types: create/edit/delete (blocks delete when meters reference it).
   - Meters: create/edit/delete; recomputes consumption when mode/baseline
     changes (NormalizationService over a fresh factory context, in a tx);
     delete cascades data (consumption+readings are Restrict → removed first).
   - A meter's ingest sources: manage on the meter-detail Sources tab
     (add/edit/delete MQTT/Tasmota/HA sources with typed config).
   - Tariffs: full CRUD (scope/component/value/validity).
   - Cost categories: CRUD + member management (meter or energy-type members).
   - Connectors: ingestion_endpoint CRUD (MQTT broker + Home Assistant);
     secrets referenced by env-var name only, never stored.
   - Settings: read-only effective-config view (settings are env-driven and
     reproducible, so an editable form would change nothing — kept honest).
   PV role is now editable on meters (MeterMeta.SetRole can clear a role).

2) Read Home Assistant — extracted a shared public HaEndpointConfig (was a
   private record in the worker), added HaConnectionTester (powers the connector
   "Test connection": checks base URL + env-resolved token, optionally reads one
   entity). Configuring an HA connector + an HA source on a meter drives the
   existing REST-poll worker end to end. (WebSocket push stays a future
   optimization; REST poll already reads HA.)

3) Wiring/placeholder audit — swept every OnClick/Href: all handlers are real,
   all internal links resolve to real routes, no TODO/stub/placeholder code.
   Fixed one genuine gap: MainLayout had no drawer toggle, so the nav was
   unreachable on narrow screens — added a hamburger button.

Tests: +6 (MeterMeta.SetRole role-removal; HaConnectionTester fail-closed
guard branches with a throwing HttpClientFactory proving no network on bad
config); render test now covers all admin routes. 69 Core + 45 Integration =
114 green. Live-verified in Docker: all admin pages 200, drawer toggle present,
Settings shows real effective config.

Claude-Session: https://claude.ai/code/session_01Lz2RqAsnQhetqWNoCDfexK

src/Infrastructure/Ingestion/HomeAssistantWorker.cs

@@ -1,5 +1,4 @@
 using System.Collections.Concurrent;
-using System.Text.Json;
 using MeterVault.Core.Domain;
 using MeterVault.Infrastructure.Persistence;
 using Microsoft.EntityFrameworkCore;
@@ -99,10 +98,8 @@ public sealed class HomeAssistantWorker(
         HaStateClient client, IngestionService ingestion, IngestionEndpoint endpoint,
         MeterSource source, SourceConfig config, CancellationToken cancellationToken)
     {
-        var endpointConfig = ParseHaEndpoint(endpoint.Config);
-        var token = string.IsNullOrWhiteSpace(endpointConfig.TokenEnv)
-            ? null
-            : Environment.GetEnvironmentVariable(endpointConfig.TokenEnv);
+        var endpointConfig = HaEndpointConfig.Parse(endpoint.Config);
+        var token = endpointConfig.ResolveToken();
 
         if (string.IsNullOrWhiteSpace(endpointConfig.BaseUrl) || string.IsNullOrWhiteSpace(token)
             || string.IsNullOrWhiteSpace(config.EntityId))
@@ -125,28 +122,4 @@ public sealed class HomeAssistantWorker(
         }
     }
 
-    private static HaEndpoint ParseHaEndpoint(string? json)
-    {
-        if (string.IsNullOrWhiteSpace(json))
-        {
-            return new HaEndpoint();
-        }
-
-        try
-        {
-            return JsonSerializer.Deserialize<HaEndpoint>(json,
-                new JsonSerializerOptions { PropertyNameCaseInsensitive = true }) ?? new HaEndpoint();
-        }
-        catch (JsonException)
-        {
-            return new HaEndpoint();
-        }
-    }
-
-    private sealed record HaEndpoint
-    {
-        public string? BaseUrl { get; init; }
-
-        public string? TokenEnv { get; init; }
-    }
 }