feat: Add ClothingSterility stub component

TODO: Port full Surgery sterility system from wega if surgery infection
mechanics are desired. Currently this is a stub component to allow
clothing prototypes to load.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Content.Shared/_Wega/Surgery/Components/ClothingSterilityComponent.cs

@@ -0,0 +1,15 @@
+// TODO: Port full Surgery sterility system from wega if surgery infection mechanics are desired.
+// Currently this is a stub component to allow clothing prototypes to load.
+// The full system is in ss14-wega: Content.Server/_Wega/Surgery/SurgerySystem.Sterility.cs
+
+namespace Content.Shared.Surgery.Components;
+
+/// <summary>
+/// Clothing component that provides a sterility modifier for surgery.
+/// </summary>
+[RegisterComponent]
+public sealed partial class ClothingSterilityComponent : Component
+{
+    [DataField("modifier")]
+    public float Modifier = 1f;
+}