Fix process tracking for Wine/Proton game processes

Process tracking failed with Proton-GE because launcher executables
(nvse_loader.exe, skse_loader.exe) exit after spawning the actual game
(FalloutNV.exe, SkyrimSE.exe).  The tracker saw the launcher exit and
declared the game done, unmounting VFS while the game was still running.

Fix: when the tracked process exits, fall back to waiting for wineserver
which stays alive as long as ANY wine process in the prefix is running.
This is the most robust way to detect when a game has truly exited,
regardless of how many launcher layers are involved.

Also:
- Use "waitforexitandrun" proton verb instead of "run" (matches umu)
- Reduce process tracking log spam (log once on first find, not every
  50ms poll cycle)

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

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