Honor service TZ in compiled schedules

[mostlydev]

Summary

• compile one resolved service timezone from Docker TZ env during claw up
• use that timezone for pod-origin schedule manifest entries when no calendar override is present
• use the same timezone in OpenClaw cron jobs and microclaw config instead of hardcoded UTC

Closes #135

Testing

• go test ./cmd/claw ./internal/driver/openclaw ./internal/driver/microclaw
• go test ./...