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

50-allow-networkmanager.rules

@@ -0,0 +1,9 @@
+// Erlaubt koptikp (uid 1000) NetworkManager ohne Passwort zu steuern.
+// Wir prüfen explizit auf uid, weil subject.local/active für SSH-Sessions
+// oft nicht das tut, was man erwartet (logind behandelt SSH-Logins anders).
+polkit.addRule(function(action, subject) {
+  if (action.id.indexOf("org.freedesktop.NetworkManager.") === 0 &&
+      subject.user === "koptikp") {
+    return polkit.Result.YES;
+  }
+});