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

test_env_auth.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+cat > /home/koptikp/epaper-dashboard/port/.env <<'ENVEOF'
+EPAPER_ADMIN_USER=admin
+EPAPER_ADMIN_PASSWORD=changeme123
+ENVEOF
+chmod 600 /home/koptikp/epaper-dashboard/port/.env
+echo "=== .env geschrieben ==="
+ls -la /home/koptikp/epaper-dashboard/port/.env
+echo
+echo "=== restart admin ==="
+bash /home/koptikp/epaper-dashboard/port/start_admin.sh
+sleep 2
+echo
+echo "=== test mit altem passwort (sollte 401) ==="
+curl -s -u admin:admin -o /dev/null -w "admin:admin -> HTTP %{http_code}\n" http://127.0.0.1:8080/status.json
+echo "=== test mit neuem passwort (sollte 200) ==="
+curl -s -u admin:changeme123 -o /dev/null -w "admin:changeme123 -> HTTP %{http_code}\n" http://127.0.0.1:8080/status.json
+echo
+echo "=== sicherheits-check: passwort in logs? ==="
+grep -E "changeme123|admin:" /tmp/admin.log || echo "(kein Treffer in logs)"