Add Gitea to infrastructure documentation

- Added Gitea (LXC 127) to service map
- Added changelog entry for Gitea setup
- Traefik routing configured for git.kavcorp.com

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

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

docs/INFRASTRUCTURE.md

@@ -42,6 +42,7 @@
 | **AMP** | 10.4.2.26:8080 | LXC 124 (elantris) | amp.kavcorp.com | Built-in |
 | **Vaultwarden** | 10.4.2.212 | LXC 125 (pm4) | vtw.kavcorp.com | Built-in |
 | **Immich** | 10.4.2.24:2283 | LXC 126 (pm4) | immich.kavcorp.com | Built-in |
+| **Gitea** | 10.4.2.7:3000 | LXC 127 (pm4) | git.kavcorp.com | Built-in |
 | **KavNas** | 10.4.2.13 | Synology NAS | - | NAS auth |
 
 ## Storage Architecture