Refactor simulation and viewer architecture

apps/backend/Contracts/WorldContracts.Economy.cs

@@ -0,0 +1,47 @@
+namespace SpaceGame.Simulation.Api.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);