Add MUDCraft Minecraft server infrastructure

- Purpur 1.21.4 server via itzg/docker-minecraft-server (java21)
- StatefulSet with 3 PVCs: worlds (20Gi), plugins (5Gi), logs (5Gi)
- Aikar G1GC JVM flags, 6GB heap (sized for Legion's 15GB RAM)
- Postgres: mudcraft database + user in existing platform/postgres
- RCON secret + DB password via ExternalSecret → Vault
- Traefik TCP entrypoint on port 25565 for mudcraft.nook.family
- mudcraft namespace via Terraform
- Argo CD app watching k8s/mudcraft/

servers/legion/k8s/mudcraft/ingressroutetcp.yaml

@@ -0,0 +1,15 @@
+---
+# Traefik TCP route — exposes mudcraft.nook.family:25565 → mudcraft service
+apiVersion: traefik.io/v1alpha1
+kind: IngressRouteTCP
+metadata:
+  name: mudcraft-minecraft
+  namespace: mudcraft
+spec:
+  entryPoints:
+    - minecraft
+  routes:
+    - match: HostSNI(`*`)
+      services:
+        - name: mudcraft
+          port: 25565