Rename Debian package from skyview to skyview-adsb

The official Debian repositories already contain a package named
"skyview" which is associated with NASA's SkyView Virtual Observatory
(https://skyview.gsfc.nasa.gov/), a tool for astronomical data
visualization.

To avoid package naming conflicts and potential confusion for users,
this commit renames our ADS-B aircraft tracking application package
to "skyview-adsb". This clearly indicates the package's purpose
(ADS-B tracking) while maintaining the SkyView brand identity.

Changes:
- Package name: skyview → skyview-adsb
- System user/group: skyview → skyview-adsb
- Config directory: /etc/skyview → /etc/skyview-adsb
- Data directory: /var/lib/skyview → /var/lib/skyview-adsb
- Log directory: /var/log/skyview → /var/log/skyview-adsb
- Systemd service: skyview.service → skyview-adsb.service
- Documentation path: /usr/share/doc/skyview → /usr/share/doc/skyview-adsb

The binaries (/usr/bin/skyview and /usr/bin/beast-dump) remain
unchanged as they don't conflict at the filesystem level.

This ensures clean installation alongside any existing skyview
packages and prevents apt/dpkg conflicts during installation.

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

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

debian/DEBIAN/postrm

@@ -4,22 +4,22 @@ set -e
 case "$1" in
     purge)
         # Remove user and group
-        if getent passwd skyview >/dev/null 2>&1; then
-            deluser --system skyview >/dev/null 2>&1 || true
+        if getent passwd skyview-adsb >/dev/null 2>&1; then
+            deluser --system skyview-adsb >/dev/null 2>&1 || true
         fi
         
-        if getent group skyview >/dev/null 2>&1; then
-            delgroup --system skyview >/dev/null 2>&1 || true
+        if getent group skyview-adsb >/dev/null 2>&1; then
+            delgroup --system skyview-adsb >/dev/null 2>&1 || true
         fi
         
         # Remove data directories
-        rm -rf /var/lib/skyview
-        rm -rf /var/log/skyview
+        rm -rf /var/lib/skyview-adsb
+        rm -rf /var/log/skyview-adsb
         
         # Remove config directory if empty
-        rmdir /etc/skyview 2>/dev/null || true
+        rmdir /etc/skyview-adsb 2>/dev/null || true
         
-        echo "SkyView has been completely removed."
+        echo "SkyView ADS-B has been completely removed."
         ;;
     
     remove)