Add timeout for wineserver wait in daemon stop

[h4rm0n1c]

Motivation

• The stop path could hang when invoking wineserver -w, causing the daemon stop command to block indefinitely.
• Introduce a bounded wait to ensure nettts-daemon.sh stop reliably returns even if wineserver misbehaves.
• Make the wait duration configurable so users can tune behavior for their environment via an environment variable.

Description

• Add a new configurable variable WINESERVER_WAIT (from NETTTS_WINESERVER_WAIT) with a default of 5 seconds and validate its value.
• Implement wait_for_wineserver() which prefers timeout if available and otherwise runs wineserver -w in a background waiter loop with a manual timeout and warnings.
• Replace the direct wineserver -w invocation in stop_daemon() with the new wait_for_wineserver() helper.
• Emit warnings and fall back to sane defaults when NETTTS_WINESERVER_WAIT is invalid or when the wait times out.

Testing

• No automated tests were run for this change.

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