Revert "Solution Entities" (#23160)

Revert "Solution Entities (#21916)"

This reverts commit d75e743dd7.

Content.Server/Chemistry/TileReactions/CleanDecalsReaction.cs

@@ -1,3 +1,4 @@
+using System.Numerics;
 using Content.Server.Decals;
 using Content.Shared.Chemistry.Reaction;
 using Content.Shared.Chemistry.Reagent;
@@ -5,7 +6,6 @@ using Content.Shared.Decals;
 using Content.Shared.FixedPoint;
 using Robust.Shared.Map;
 using Robust.Shared.Map.Components;
-using System.Numerics;
 
 namespace Content.Server.Chemistry.TileReactions;
 
@@ -18,7 +18,7 @@ public sealed partial class CleanDecalsReaction : ITileReaction
     /// <summary>
     /// For every cleaned decal we lose this much reagent.
     /// </summary>
-    [DataField]
+    [DataField("cleanCost")]
     public FixedPoint2 CleanCost { get; private set; } = FixedPoint2.New(0.25f);
 
     public FixedPoint2 TileReact(TileRef tile, ReagentPrototype reagent, FixedPoint2 reactVolume)