fix: expose Gitea SSH port 2222 and update SSH_PORT setting

- Add ports mapping to expose SSH port 2222 on host
- Change SSH_PORT from 22 to 2222 for correct clone URL display
- Gitea will now show git@dev.pivoine.art:2222/user/repo.git in UI

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

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

dev/compose.yaml

@@ -6,6 +6,8 @@ services:
     restart: unless-stopped
     depends_on:
       - gitea_runner
+    ports:
+      - "2222:2222"
     volumes:
       - gitea_data:/data
       - gitea_config:/etc/gitea
@@ -27,7 +29,7 @@ services:
       GITEA__server__PROTOCOL: http
       GITEA__server__HTTP_PORT: 3000
       GITEA__server__START_SSH_SERVER: true
-      GITEA__server__SSH_PORT: 22
+      GITEA__server__SSH_PORT: 2222
       GITEA__server__SSH_LISTEN_PORT: 2222
       GITEA__mailer__ENABLED: true
       GITEA__mailer__PROTOCOL: smtps