Tailscale installed via apt/snap/brew was reported "Not Installed/Logged In"
because 9Router only probed its custom userspace socket. Probe the system
socket (/var/run/tailscale/tailscaled.sock) as fallback, add /usr/sbin and
/snap/bin to candidate paths and EXTENDED_PATH, and report separate
customDaemonRunning/systemDaemonRunning flags. Caching/non-blocking behavior
preserved.
Co-authored-by: Stefan Pirker <stefan.pirker86@gmail.com>
Co-authored-by: Cursor <cursoragent@cursor.com>
