v0.3.13

fix(gui): recognize running bridge + single-instance for settings window

Two bugs causing the user-visible confusion in today's session:

1. _bridge_process_running() was hard-coded to look for
   "360booking-bridge-setup.exe", but after the --install flow the
   binary lives in Program Files as "360booking-bridge.exe" (no
   -setup suffix). Result: GUI always showed "Proces: oprit" with
   grey/red dots even though services.msc correctly reported RUNNING.
   Now checks both names AND falls back to `sc query` of the service
   so a non-admin user session that can't see LocalSystem processes
   in tasklist still gets the right answer.

2. Every click on tray → "Deschide setări bridge" spawned a fresh
   subprocess of `<exe> --gui`, piling up windows ("refreshul ala
   ciudat se tot deschide o fereastra"). Added a single-instance
   check via FindWindowW — if a window with the "360booking Fiscal
   Bridge" title already exists, raise it to front and exit instead
   of creating a second copy.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>