When users explicitly specify a port via command-line flags (e.g., -s3.port=8333),
the server should fail immediately if the port is unavailable, rather than silently
falling back to an alternative port. This prevents user confusion and makes misconfiguration
failures obvious.
Changes:
- Modified ensurePortAvailableOnIP() to check if a port was explicitly passed via isFlagPassed()
- If an explicit port is unavailable, return error instead of silently allocating alternative
- Updated ensureAllPortsAvailableOnIP() to handle the returned error and fail startup
- Modified runMini() to check error from ensureAllPortsAvailableOnIP() and return false on failure
- Default ports (not explicitly specified) continue to fallback to available alternatives
This ensures:
- Explicit ports: fail if unavailable (e.g., -s3.port=8333 fails if 8333 is taken)
- Default ports: fallback to alternatives (e.g., s3.port without flag falls back to 8334 if 8333 taken)
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