refactor(bootstrap): finalize load-index migration; GlobalsImporter is now a stub

Stage 9C of the bootstrap-seed-refactor:

- Add 6 seed DTOs for the card-id-keyed load-index tables (SpotCard,
  ReprintedCard, UnlimitedRestriction, LoadingExclusionCard, MaintenanceCard,
  FeatureMaintenance).
- Add CardListsImporter: idempotent upsert of the 6 tables, sharing one
  Cards FK set for orphan-warning. FeatureMaintenances clear-and-rewrites
  (synthetic ordinal Id; no natural key).
- Add RotationFlagUpdater: reads RotationConfig.RotationCardSetIds from the
  GameConfigs section (populated by RotationConfigImporter) and flips
  CardSet.IsInRotation to match.
- Add RotationConfig.RotationCardSetIds list property + wire it through
  RotationConfigImporter. No migration needed (sections are JSON blobs).
- RotationConfigImporter: use legacy local-kind DateTime parse for schedule
  windows so the JSON round-trip stays byte-equivalent to GlobalsImporter.
- Strip GlobalsImporter down to a no-op stub (Task 10 will delete it).
- Wire all 9 new importers into Program.cs and SVSimTestFactory.SeedGlobalsAsync,
  in the order RotationConfigImporter -> ... -> CardListsImporter -> RotationFlagUpdater.
- Delete prod-captures/load-index-2026-05-23.json.
- Add CardListsImporterTests covering each sub-table, idempotency,
  empty-seed handling, orphan-warning, and the clear-and-rewrite path.

Tests: 391 passing (382 baseline + 9 new).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

SVSim.Bootstrap/Importers/RotationFlagUpdater.cs

@@ -0,0 +1,64 @@
+using System.Text.Json;
+using Microsoft.EntityFrameworkCore;
+using SVSim.Database;
+using SVSim.Database.Models.Config;
+
+namespace SVSim.Bootstrap.Importers;
+
+/// <summary>
+/// Reads <see cref="RotationConfig"/> from the GameConfigs table (populated by
+/// <see cref="RotationConfigImporter"/>) and flips <c>CardSet.IsInRotation</c> to match.
+/// Must run after RotationConfigImporter and CardImporter — CardSets missing from the DB
+/// can't be promoted (the original GlobalsImporter behavior; we log a warning instead of failing).
+/// </summary>
+public class RotationFlagUpdater
+{
+    public async Task<int> UpdateAsync(SVSimDbContext context)
+    {
+        var sectionName = typeof(RotationConfig).GetCustomAttributes(typeof(ConfigSectionAttribute), inherit: false)
+            .Cast<ConfigSectionAttribute>().FirstOrDefault()?.Name
+            ?? throw new InvalidOperationException("RotationConfig missing [ConfigSection]");
+
+        var row = await context.GameConfigs.FirstOrDefaultAsync(s => s.SectionName == sectionName);
+        if (row is null)
+        {
+            Console.WriteLine("[RotationFlagUpdater] No Rotation section in GameConfigs; skipping.");
+            return 0;
+        }
+
+        var cfg = JsonSerializer.Deserialize<RotationConfig>(row.ValueJson);
+        if (cfg is null)
+        {
+            Console.WriteLine("[RotationFlagUpdater] Failed to deserialize RotationConfig; skipping.");
+            return 0;
+        }
+
+        var rotationSet = (cfg.RotationCardSetIds ?? new List<int>()).ToHashSet();
+        if (rotationSet.Count == 0)
+        {
+            Console.WriteLine("[RotationFlagUpdater] RotationCardSetIds empty; no flag changes.");
+            return 0;
+        }
+
+        var allSets = await context.CardSets.ToListAsync();
+        int updated = 0, missing = 0;
+        foreach (var rid in rotationSet)
+        {
+            var set = allSets.FirstOrDefault(s => s.Id == rid);
+            if (set is null) { missing++; continue; }
+            if (!set.IsInRotation) { set.IsInRotation = true; updated++; }
+        }
+        // Demote sets not in the current rotation.
+        foreach (var s in allSets.Where(s => s.IsInRotation && !rotationSet.Contains(s.Id)))
+        {
+            s.IsInRotation = false;
+            updated++;
+        }
+        if (missing > 0)
+            Console.Error.WriteLine($"[RotationFlagUpdater] Warning: {missing} rotation card_set_id(s) missing from CardSets — run CardImporter first.");
+
+        await context.SaveChangesAsync();
+        Console.WriteLine($"[RotationFlagUpdater] CardSet.IsInRotation ~{updated}");
+        return updated;
+    }
+}