Pack logic cleanup

SVSim.Database/Models/Config/PackRateConfig.cs

@@ -0,0 +1,47 @@
+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 },
+    ];
+}