docs: add Minecraft server, WiFi DHCP fix to changelog

- Added Minecraft Java server section to 03-SERVICES-OTHER.md
- Documented WiFi DHCP fix (VLAN 40 tagged→untagged on wifi1/wifi2)
- Documented Minecraft deployment and hairpin NAT setup

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/03-SERVICES-OTHER.md

@@ -104,6 +104,26 @@ Non-critical services that enhance functionality but don't affect core network o
 
 ---
 
+## Gaming
+
+### Minecraft Server
+
+| Component | IP | Port | Address |
+|-----------|-----|------|---------|
+| minecraft | 172.18.0.80 | 25565 | minecraft.xtrm-lab.org |
+
+**Image:** itzg/minecraft-server (Java Edition)
+**Version:** Latest (1.21.11)
+**Mode:** Survival, Normal difficulty, PVP enabled
+**Max Players:** 10
+**RAM:** 2 GB
+**Online Mode:** Yes (requires paid account)
+**Data:** `/mnt/user/appdata/minecraft/data`
+**NAT:** WAN:25565 → 192.168.10.20:25565 + hairpin NAT
+**Dockge Stack:** `minecraft`
+
+---
+
 ## Media
 
 ### Plex