feat(missions): mission catalog + viewer mission repositories

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

SVSim.Database/Repositories/Mission/IMissionCatalogRepository.cs

@@ -0,0 +1,24 @@
+using SVSim.Database.Models;
+
+namespace SVSim.Database.Repositories.Mission;
+
+public interface IMissionCatalogRepository
+{
+    Task<List<MissionCatalogEntry>> GetByLotTypeAsync(int lotType, CancellationToken ct);
+    Task<List<MissionCatalogEntry>> GetByIdsAsync(IReadOnlyCollection<int> ids, CancellationToken ct);
+    Task<MissionCatalogEntry?> GetByIdAsync(int id, CancellationToken ct);
+
+    Task<List<MissionCatalogEntry>> GetByEventTypesAsync(IReadOnlyCollection<string> eventTypes, CancellationToken ct);
+    Task<List<AchievementCatalogEntry>> GetAchievementsByEventTypesAsync(IReadOnlyCollection<string> eventTypes, CancellationToken ct);
+
+    /// <summary>All distinct achievement_type values present in the catalog. Used by /load/index materialization.</summary>
+    Task<List<int>> GetAllAchievementTypesAsync(CancellationToken ct);
+
+    /// <summary>MAX(Level) per achievement_type — cached. Used to compute wire max_level.</summary>
+    Task<IReadOnlyDictionary<int, int>> GetMaxLevelByAchievementTypeAsync(CancellationToken ct);
+
+    /// <summary>Catalog row at (type, level), or null if no such tier has been captured.</summary>
+    Task<AchievementCatalogEntry?> GetAchievementAsync(int achievementType, int level, CancellationToken ct);
+
+    Task<List<BattlePassMonthlyMissionEntry>> GetMonthlyMissionsAsync(int year, int month, CancellationToken ct);
+}