Arma 3 changes its own working directory to the exe folder on startup,
so relative paths like -config=server.cfg resolved against A3Master/
instead of the server data dir. Configs were never found, and profile/
battleye dirs pointed at the wrong location (confirmed via RPT location
in A3Master/server/ instead of the data dir).
build_launch_args() now accepts an optional server_dir: Path argument.
When provided, all four path args (-config, -cfg, -profiles, -bepath)
use absolute paths. Service passes server_dir at the call site.
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