Release v3.0.0

- Bump version to 3.0.0 and update docs

- Fix Debian payload to include TUI and install /usr/bin/sensorpajen-tui wrapper

- Make systemd unit upgrades safer and ignore deb build artifacts

debian/postinst

@@ -87,11 +87,21 @@ case "$1" in
             echo "Warning: setcap not found (install libcap2-bin package)"
         fi
 
-        # Install systemd service file
-        if [ -f /opt/sensorpajen/debian/sensorpajen.service ]; then
-            cp /opt/sensorpajen/debian/sensorpajen.service /etc/systemd/system/
-        elif [ -f /usr/share/doc/sensorpajen/sensorpajen.service ]; then
-            cp /usr/share/doc/sensorpajen/sensorpajen.service /etc/systemd/system/
+        # v2 installed a unit into /etc/systemd/system/, which overrides packaged units
+        # and prevents upgrades from taking effect. If that file exists and is identical
+        # to the packaged unit, remove the override.
+        if [ -f /etc/systemd/system/sensorpajen.service ]; then
+            PACKAGED_UNIT=""
+            if [ -f /lib/systemd/system/sensorpajen.service ]; then
+                PACKAGED_UNIT="/lib/systemd/system/sensorpajen.service"
+            elif [ -f /usr/lib/systemd/system/sensorpajen.service ]; then
+                PACKAGED_UNIT="/usr/lib/systemd/system/sensorpajen.service"
+            fi
+
+            if [ -n "$PACKAGED_UNIT" ] && diff -q /etc/systemd/system/sensorpajen.service "$PACKAGED_UNIT" >/dev/null 2>&1; then
+                rm -f /etc/systemd/system/sensorpajen.service
+                echo "Removed redundant /etc override unit (upgrade-safe)"
+            fi
         fi
 
         # Reload systemd