fix: Correct systemd configuration and Debian package setup

- Fix database update service to include config path parameter
- Move ConditionACPower from [Timer] to [Unit] section in timer config
- Add database directory to ReadWritePaths in main service
- Set explicit database path in Debian package config template
- Simplify postinst script to be quiet and use consistent skyview-adsb user
- Update README.Debian with comprehensive systemd service documentation
- Remove confusing dual-user setup in favor of single skyview-adsb user

SystemD Configuration Summary:
- Main service: skyview-adsb.service with database pre-update
- Database service: skyview-database-update.service (oneshot)
- Weekly timer: skyview-database-update.timer (Sunday 3AM with randomization)
- All services use skyview-adsb user consistently
- Database path: /var/lib/skyview-adsb/skyview.db
- Config path: /etc/skyview-adsb/config.json

🤖 Generated with [Claude Code](https://claude.ai/code)

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

debian/lib/systemd/system/skyview-adsb.service

@@ -39,8 +39,8 @@ RestrictNamespaces=true
 # Allow network access
 PrivateNetwork=false
 
-# Allow writing to log directory
-ReadWritePaths=/var/log/skyview-adsb
+# Allow writing to log and database directories
+ReadWritePaths=/var/log/skyview-adsb /var/lib/skyview-adsb
 
 # Capabilities
 CapabilityBoundingSet=CAP_NET_BIND_SERVICE