Add winner archive, host image upload and live demo data

Deliver the demo-ready feature set and seed data so the live site can be
presented end to end:

- Winner archive: ArchivedWinner domain, admin CRUD endpoints/view/manager
  and public archive surface, backed by AddArchivedWinners migration.
- Host presentation: host image upload and artist name on SiteSettings with
  public image endpoint and supporting migrations.
- Clip submissions: idempotent table-ensure migration plus current-season
  demo clips for review workflows.
- Demo seed data: sponsors, share links and 2025 archived winners, with a
  guarded RemoveDemoSeasons cleanup; all seeds guard against real data.
- EnsureRuntimeSchemaParity migration to align runtime schema defensively.
- Admin/home UI refinements; remove unused team role permissions modal and
  dead share-quick-links code.

All seed and schema migrations are idempotent (IF NOT EXISTS / ON CONFLICT)
and skip when real season data is present.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Backend/Services/TrackingRulesSettings.cs

@@ -124,7 +124,7 @@ public static class TrackingRulesSettings
         new(FlagTrackerUnresolved, "Tracker-Link nicht aufloesbar", true, "high", "Der Stream-Link konnte nicht sauber in einen Twitch-Channel aufgeloest werden.", true, true, false, false),
         new(FlagUnsupportedPlatform, "Plattform nicht unterstuetzt", true, "medium", "Die Nominierung zeigt auf eine Plattform ohne automatische TwitchTracker-Daten.", true, true, false, false),
         new(FlagNoTrackerData, "Keine Tracker-Daten", true, "medium", "TwitchTracker hat keinen belastbaren Summary-Wert geliefert.", true, true, false, false),
-        new(FlagMissingRequiredMetric, "Pflichtmetrik fehlt", true, "high", "Mindestens eine aktivierte Pflichtmetrik fuer die Auto-Klassifizierung fehlt.", true, true, true, false),
+        new(FlagMissingRequiredMetric, "Pflichtmetrik fehlt", true, "high", "Mindestens eine aktivierte Pflichtmetrik fuer die Auto-Klassifizierung fehlt.", true, true, false, false),
         new(FlagManualReviewRequired, "Manuelle Pruefung noetig", true, "medium", "Die Auto-Daten reichen nicht fuer eine sichere Review-Entscheidung.", true, true, false, false),
         new(FlagLowConfidenceSmallChannel, "Low Confidence Small Channel", false, "low", "Kleine Kanaele koennen manuell tiefer geprueft werden.", false, true, false, false),
         new(FlagInsufficientActivityContext, "Zu wenig Aktivitaetskontext", false, "low", "Ohne zusaetzliche Kontextdaten wie Streamstunden ist die Bewertung unsicher.", false, true, false, false),
@@ -206,7 +206,9 @@ public static class TrackingRulesSettings
 
         try
         {
-            return JsonSerializer.Deserialize<TrackingFlagHit[]>(json, JsonOptions) ?? [];
+            return (JsonSerializer.Deserialize<TrackingFlagHit[]>(json, JsonOptions) ?? [])
+                .Select(flag => flag with { BlocksApproval = false })
+                .ToArray();
         }
         catch (JsonException)
         {
@@ -333,7 +335,7 @@ public static class TrackingRulesSettings
             Severity = severity,
             AutoTriggerEnabled = stored.AutoTriggerEnabled,
             RequiresManualReview = stored.RequiresManualReview,
-            BlocksApproval = stored.BlocksApproval,
+            BlocksApproval = false,
             AdminNoteRequiredOnOverride = stored.AdminNoteRequiredOnOverride,
         };
     }