Refactor backend into domain-first slices

apps/backend/Economy/Contracts/Economy.cs

@@ -0,0 +1,47 @@
+namespace SpaceGame.Api.Economy.Contracts;
+
+public sealed record MarketOrderSnapshot(
+  string Id,
+  string FactionId,
+  string? StationId,
+  string? ConstructionSiteId,
+  string Kind,
+  string ItemId,
+  float Amount,
+  float RemainingAmount,
+  float Valuation,
+  float? ReserveThreshold,
+  string? PolicySetId,
+  string State);
+
+public sealed record MarketOrderDelta(
+  string Id,
+  string FactionId,
+  string? StationId,
+  string? ConstructionSiteId,
+  string Kind,
+  string ItemId,
+  float Amount,
+  float RemainingAmount,
+  float Valuation,
+  float? ReserveThreshold,
+  string? PolicySetId,
+  string State);
+
+public sealed record PolicySetSnapshot(
+  string Id,
+  string OwnerKind,
+  string OwnerId,
+  string TradeAccessPolicy,
+  string DockingAccessPolicy,
+  string ConstructionAccessPolicy,
+  string OperationalRangePolicy);
+
+public sealed record PolicySetDelta(
+  string Id,
+  string OwnerKind,
+  string OwnerId,
+  string TradeAccessPolicy,
+  string DockingAccessPolicy,
+  string ConstructionAccessPolicy,
+  string OperationalRangePolicy);

apps/backend/Economy/Runtime/CommerceRuntimeModels.cs

@@ -0,0 +1,30 @@
+namespace SpaceGame.Api.Economy.Runtime;
+
+public sealed class MarketOrderRuntime
+{
+  public required string Id { get; init; }
+  public required string FactionId { get; init; }
+  public string? StationId { get; init; }
+  public string? ConstructionSiteId { get; init; }
+  public required string Kind { get; init; }
+  public required string ItemId { get; init; }
+  public float Amount { get; init; }
+  public float RemainingAmount { get; set; }
+  public float Valuation { get; set; }
+  public float? ReserveThreshold { get; set; }
+  public string? PolicySetId { get; set; }
+  public string State { get; set; } = MarketOrderStateKinds.Open;
+  public string LastDeltaSignature { get; set; } = string.Empty;
+}
+
+public sealed class PolicySetRuntime
+{
+  public required string Id { get; init; }
+  public required string OwnerKind { get; init; }
+  public required string OwnerId { get; init; }
+  public string TradeAccessPolicy { get; set; } = "owner-and-allies";
+  public string DockingAccessPolicy { get; set; } = "owner-and-allies";
+  public string ConstructionAccessPolicy { get; set; } = "owner-only";
+  public string OperationalRangePolicy { get; set; } = "unrestricted";
+  public string LastDeltaSignature { get; set; } = string.Empty;
+}