Remove all Assigned Values that are Never Used (#30110)

Remove all Assigned Values that are never used

Content.Server/Ninja/Systems/SpaceNinjaSystem.cs

@@ -32,10 +32,7 @@ public sealed class SpaceNinjaSystem : SharedSpaceNinjaSystem
     [Dependency] private readonly AlertsSystem _alerts = default!;
     [Dependency] private readonly BatterySystem _battery = default!;
     [Dependency] private readonly CodeConditionSystem _codeCondition = default!;
-    [Dependency] private readonly IChatManager _chatMan = default!;
     [Dependency] private readonly PowerCellSystem _powerCell = default!;
-    [Dependency] private readonly RoleSystem _role = default!;
-    [Dependency] private readonly SharedAudioSystem _audio = default!;
     [Dependency] private readonly SharedMindSystem _mind = default!;
 
     public override void Initialize()