Pack logic cleanup

SVSim.Database/Models/Config/ChallengeConfig.cs

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+using Microsoft.EntityFrameworkCore;
+
+namespace SVSim.Database.Models.Config;
+
+[Owned]
+public class ChallengeConfig
+{
+    public bool UseTwoPickPremiumCard { get; set; }
+    public long TwoPickSleeveId { get; set; }
+}

SVSim.Database/Models/Config/DefaultGrantsConfig.cs

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+using Microsoft.EntityFrameworkCore;
+
+namespace SVSim.Database.Models.Config;
+
+/// <summary>Per-viewer-registration default currency grants.</summary>
+[Owned]
+public class DefaultGrantsConfig
+{
+    public ulong Crystals { get; set; } = 50000;
+    public ulong Rupees { get; set; } = 50000;
+    public ulong Ether { get; set; } = 50000;
+}

SVSim.Database/Models/Config/DefaultLoadoutConfig.cs

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+using Microsoft.EntityFrameworkCore;
+
+namespace SVSim.Database.Models.Config;
+
+/// <summary>
+/// Default cosmetic loadout ids for a newly-registered viewer. These used to be FK columns;
+/// they're now untyped longs in the jsonb tree. Validation would live in a future config-editing
+/// UI (see project-wide TODO(config-validation)).
+/// </summary>
+[Owned]
+public class DefaultLoadoutConfig
+{
+    public int DegreeId { get; set; } = 300003;
+    public int EmblemId { get; set; } = 100000000;
+    public int MyPageBackgroundId { get; set; } = 100000000;
+    public int SleeveId { get; set; } = 3000011;
+}

SVSim.Database/Models/Config/PackRateConfig.cs

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+using Microsoft.EntityFrameworkCore;
+
+namespace SVSim.Database.Models.Config;
+
+/// <summary>
+/// Tunables for pack-opening RNG. Defaults reproduce the original Shadowverse Classic rates
+/// exactly so the cutover from hardcoded magic numbers is zero-behavior-change.
+/// </summary>
+[Owned]
+public class PackRateConfig
+{
+    /// <summary>
+    /// Per-card-slot probability of upgrading any drawn card to its foil/animated twin.
+    /// Applied AFTER rarity selection — independent of rarity, slot position, and pack category.
+    /// Default 0.08 (8%). Cards without a foil twin in master data keep the non-foil silently.
+    /// </summary>
+    public double AnimatedRate { get; set; } = 0.08;
+
+    /// <summary>
+    /// Global default rarity weights, used for any slot that has no entry in
+    /// <see cref="PerSlot"/>. Defaults match SV Classic main-slot. Weights sum to 0.9994;
+    /// the 0.06% slack absorbs into Bronze via the PickRarity catch-all band.
+    /// </summary>
+    public SlotRarityWeights Default { get; set; } = new()
+    {
+        Bronze = 0.6744, Silver = 0.25, Gold = 0.06, Legendary = 0.015,
+    };
+
+    /// <summary>
+    /// Per-slot overrides (1-based slot index) applied to all packs. A missing slot falls back
+    /// to <see cref="Default"/>. Each entry is a FULL OVERRIDE, not a delta — if you change
+    /// <see cref="Default"/>, existing PerSlot entries do NOT auto-recompute. The slot-8 default
+    /// expresses the SV Classic "Silver-or-better guarantee" as data (Bronze=0) instead of a
+    /// separate code path.
+    /// </summary>
+    /// <summary>
+    /// Per-slot overrides keyed by 1-based slot index (stored as a list for EF Core 8 json
+    /// compatibility — Dictionary&lt;string,T&gt; of complex owned types is not supported).
+    /// Look up by <see cref="SlotRarityWeights.Slot"/>. A missing slot falls back to
+    /// <see cref="Default"/>. Slot-8 entry expresses the SV Classic "Silver-or-better
+    /// guarantee" as data (Bronze=0).
+    /// </summary>
+    public List<SlotRarityWeights> PerSlot { get; set; } =
+    [
+        new() { Slot = "8", Bronze = 0, Silver = 0.7692, Gold = 0.1846, Legendary = 0.0462 },
+    ];
+}

SVSim.Database/Models/Config/PlayerConfig.cs

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+using Microsoft.EntityFrameworkCore;
+
+namespace SVSim.Database.Models.Config;
+
+[Owned]
+public class PlayerConfig
+{
+    public int MaxFriends { get; set; } = 20;
+}

SVSim.Database/Models/Config/RotationConfig.cs

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+using Microsoft.EntityFrameworkCore;
+
+namespace SVSim.Database.Models.Config;
+
+/// <summary>
+/// Time-varying season/rotation state, populated by GlobalsImporter from prod captures.
+/// </summary>
+[Owned]
+public class RotationConfig
+{
+    public string TsRotationId { get; set; } = "";
+    public bool IsBattlePassPeriod { get; set; }
+    public bool IsBeginnerMission { get; set; }
+    public int CardSetIdForResourceDlView { get; set; }
+}

SVSim.Database/Models/Config/SlotRarityWeights.cs

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+using Microsoft.EntityFrameworkCore;
+
+namespace SVSim.Database.Models.Config;
+
+/// <summary>
+/// Per-rarity weights for a single pack slot. Sum should be ≤ 1.0;
+/// remainder absorbs into Bronze via the PickRarity catch-all band.
+/// <para>
+/// <see cref="Slot"/> is the 1-based slot index as a string (e.g. "8") and is used as the
+/// lookup key in <see cref="PackRateConfig.PerSlot"/>. It is empty/null for the global
+/// <see cref="PackRateConfig.Default"/> entry, which has no slot affiliation.
+/// </para>
+/// </summary>
+[Owned]
+public class SlotRarityWeights
+{
+    /// <summary>1-based slot index (as a string) for entries in PerSlot. Null/empty for the Default entry.</summary>
+    public string? Slot { get; set; }
+    public double Bronze { get; set; }
+    public double Silver { get; set; }
+    public double Gold { get; set; }
+    public double Legendary { get; set; }
+}