Initial commit: epaper-dashboard for 7.3" ACeP 7-Color display

- dashboard.py: plugin-based renderer with 4x4 grid layout
- admin.py: web UI with layout editor + plugin configs
- layout.py: pack algorithm, item placement, grid system
- plugins/: clock, weather, system, spotify, strava, gmail, minimax, hello
- network_watchdog.py: WiFi AP/client mode management
- waveshare_epd_init.py: vendor driver stub

install_polkit.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+# Erlaubt dem koptikp-User NetworkManager ohne Passwort zu steuern.
+# Wird via polkit ausgewertet.
+set -e
+
+RULE='polkit.addRule(function(action, subject) {
+  if (action.id.indexOf("org.freedesktop.NetworkManager.") === 0 &&
+      subject.local === true && subject.active === true) {
+    return polkit.Result.YES;
+  }
+});'
+
+RULE_FILE="/etc/polkit-1/rules.d/50-allow-networkmanager.rules"
+echo "Schreibe $RULE_FILE..."
+sudo -n bash -c "cat > $RULE_FILE <<'RULEEOF'
+$POLKIT_RULE
+RULEEOF
+chmod 644 $RULE_FILE"
+
+echo "--- Inhalt: ---"
+cat $RULE_FILE
+echo
+echo "--- Test: nmcli hotspot (kein pw mehr nötig) ---"
+sudo -n nmcli device wifi hotspot ifname wlan0 ssid epaper-test password test1234
+sleep 3
+nmcli -t -f NAME,TYPE,DEVICE connection show --active
+echo
+echo "--- Cleanup ---"
+sudo -n nmcli connection down epaper-test 2>&1
+sudo -n nmcli connection delete epaper-test 2>&1
+echo "Fertig."