fix: re-enable Gitea SSH, expose on port 2222

SSH is needed for git operations (git@server:repo.git).
HTTP stays localhost-only (accessed via SSH tunnel for UI).

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

gitea/docker-compose.yml

@@ -5,10 +5,10 @@ services:
     restart: always
     ports:
       - "127.0.0.1:3100:3000"
+      - "2222:22"
     volumes:
       - /data/server-infra/gitea:/data
       - /etc/timezone:/etc/timezone:ro
       - /etc/localtime:/etc/localtime:ro
     environment:
       - GITEA__database__DB_TYPE=sqlite3
-      - GITEA__server__SSH_DISABLED=true