fix: pass environment variables to remote shell via env command

Fixes SSH heredoc environment variable passing in health-check.sh.
Environment variables must be set on the remote side using 'env'
command, not on the local side before SSH.

This is the same fix applied to deploy-stacks.sh, rollback-stacks.sh,
and cleanup-stack.sh in commit d14c671.

Resolves docker-piwine-office run #20544121131 failure:
'/bin/bash: line 203: local: can only be used in a function'

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

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

Author: owine

scripts/deployment/health-check.sh

@@ -78,7 +78,7 @@ log_info "Health check timeout: ${HEALTH_TIMEOUT}s, Command timeout: ${COMMAND_T
 export OP_SERVICE_ACCOUNT_TOKEN="$OP_TOKEN"
 
 set +e
-HEALTH_RESULT=$(ssh_retry 3 5 "OP_SERVICE_ACCOUNT_TOKEN=\"$OP_TOKEN\" HEALTH_TIMEOUT=\"$HEALTH_TIMEOUT\" COMMAND_TIMEOUT=\"$COMMAND_TIMEOUT\" CRITICAL_SERVICES='$CRITICAL_SERVICES' ssh -o \"StrictHostKeyChecking no\" $SSH_USER@$SSH_HOST /bin/bash -s $STACKS \"$HAS_DOCKGE\"" << 'EOF'
+HEALTH_RESULT=$(ssh_retry 3 5 "ssh -o \"StrictHostKeyChecking no\" $SSH_USER@$SSH_HOST env OP_SERVICE_ACCOUNT_TOKEN=\"$OP_TOKEN\" HEALTH_TIMEOUT=\"$HEALTH_TIMEOUT\" COMMAND_TIMEOUT=\"$COMMAND_TIMEOUT\" CRITICAL_SERVICES='$CRITICAL_SERVICES' /bin/bash -s $STACKS \"$HAS_DOCKGE\"" << 'EOF'
   set -e
 
   # Get arguments passed to script (excluding sensitive OP_TOKEN)