chore: migrate from GitLab to self-hosted Gitea

Update bootstrap_supervisor.sh and setup_server.sh to use
git.padelnomics.io:2222 instead of gitlab.com.

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

infra/setup_server.sh

@@ -75,7 +75,8 @@ fi
 
 if [ ! -f "${SSH_DIR}/config" ]; then
     cat > "${SSH_DIR}/config" <<EOF
-Host gitlab.com
+Host git.padelnomics.io
+    Port 2222
     IdentityFile ${DEPLOY_KEY}
     IdentitiesOnly yes
 EOF
@@ -83,7 +84,7 @@ EOF
     chmod 600 "${SSH_DIR}/config"
 fi
 
-ssh-keyscan -H gitlab.com >> "${SSH_DIR}/known_hosts" 2>/dev/null
+ssh-keyscan -H -p 2222 git.padelnomics.io >> "${SSH_DIR}/known_hosts" 2>/dev/null
 sort -u "${SSH_DIR}/known_hosts" -o "${SSH_DIR}/known_hosts"
 chown "${SERVICE_USER}:${SERVICE_USER}" "${SSH_DIR}/known_hosts"
 chmod 644 "${SSH_DIR}/known_hosts"