refactor(backend): align api namespaces and project name

apps/backend/Contracts/Celestial.cs

@@ -0,0 +1,83 @@
+namespace SpaceGame.Api.Contracts;
+
+public sealed record StarSnapshot(
+  string Kind,
+  string Color,
+  string Glow,
+  float Size,
+  float OrbitRadius,
+  float OrbitSpeed,
+  float OrbitPhaseAtEpoch);
+
+public sealed record MoonSnapshot(
+  string Label,
+  float Size,
+  string Color,
+  float OrbitRadius,
+  float OrbitSpeed,
+  float OrbitPhaseAtEpoch,
+  float OrbitInclination,
+  float OrbitLongitudeOfAscendingNode);
+
+public sealed record SystemSnapshot(
+  string Id,
+  string Label,
+  Vector3Dto GalaxyPosition,
+  IReadOnlyList<StarSnapshot> Stars,
+  IReadOnlyList<PlanetSnapshot> Planets);
+
+public sealed record PlanetSnapshot(
+  string Label,
+  string PlanetType,
+  string Shape,
+  IReadOnlyList<MoonSnapshot> Moons,
+  float OrbitRadius,
+  float OrbitSpeed,
+  float OrbitEccentricity,
+  float OrbitInclination,
+  float OrbitLongitudeOfAscendingNode,
+  float OrbitArgumentOfPeriapsis,
+  float OrbitPhaseAtEpoch,
+  float Size,
+  string Color,
+  bool HasRing);
+
+public sealed record ResourceNodeSnapshot(
+  string Id,
+  string SystemId,
+  Vector3Dto LocalPosition,
+  string? CelestialId,
+  string SourceKind,
+  float OreRemaining,
+  float MaxOre,
+  string ItemId);
+
+public sealed record ResourceNodeDelta(
+  string Id,
+  string SystemId,
+  Vector3Dto LocalPosition,
+  string? CelestialId,
+  string SourceKind,
+  float OreRemaining,
+  float MaxOre,
+  string ItemId);
+
+public sealed record CelestialSnapshot(
+  string Id,
+  string SystemId,
+  string Kind,
+  Vector3Dto OrbitalAnchor,
+  float LocalSpaceRadius,
+  string? ParentNodeId,
+  string? OccupyingStructureId,
+  string? OrbitReferenceId);
+
+public sealed record CelestialDelta(
+  string Id,
+  string SystemId,
+  string Kind,
+  Vector3Dto OrbitalAnchor,
+  float LocalSpaceRadius,
+  string? ParentNodeId,
+  string? OccupyingStructureId,
+  string? OrbitReferenceId);