systemd runs services with a minimal PATH that may not include
/usr/bin or /usr/sbin. Add _safe_env() helpers that ensure standard
paths are present, and expand apt-cache discovery to check common
locations directly.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Full NetworkManager (nmcli) backed network management:
- Backend: new network.py router with endpoints for device status,
connection config, IPv4 DHCP/static toggle, WiFi scan/connect/disconnect
- Frontend: interactive network settings UI with per-device config,
WiFi network list with signal strength, inline password input
- Graceful 503 fallback to read-only psutil view when nmcli unavailable
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
