Initial commit: Paperwall, a standalone e-ink dashboard

Navidrome now-playing, clock, and weather for a Waveshare epd4in0e panel,
with a local web UI and install/uninstall scripts for the Pi.

web/templates/base.html

@@ -0,0 +1,38 @@
+<!doctype html>
+<html lang="de">
+<head>
+  <meta charset="utf-8">
+  <title>Paperwall</title>
+  <style>
+    body { font-family: system-ui, sans-serif; max-width: 640px; margin: 2rem auto; padding: 0 1rem; color: #222; }
+    .brand { font-weight: 700; font-size: 1.1rem; margin-bottom: 1rem; }
+    nav { display: flex; gap: 1rem; margin-bottom: 1.5rem; font-size: 0.9rem; }
+    nav a { color: #444; text-decoration: none; }
+    nav a:hover { text-decoration: underline; }
+    h1 { font-size: 1.3rem; }
+    .field { margin-bottom: 1rem; }
+    label { display: block; font-weight: 600; margin-bottom: 0.25rem; font-size: 0.9rem; }
+    input[type=text], input[type=password], input[type=number] {
+      width: 100%; padding: 0.5rem; box-sizing: border-box; border: 1px solid #ccc; border-radius: 4px;
+    }
+    .checkbox { display: flex; align-items: center; gap: 0.5rem; font-weight: normal; margin-bottom: 0.5rem; }
+    .checkbox input { width: auto; }
+    button { padding: 0.5rem 1rem; border: 0; border-radius: 4px; background: #222; color: white; cursor: pointer; }
+    button.secondary { background: #eee; color: #222; }
+    .preview { border: 1px solid #ccc; max-width: 100%; }
+    .status-grid { display: grid; grid-template-columns: auto 1fr; gap: 0.25rem 1rem; font-size: 0.9rem; margin: 1rem 0; }
+    .actions { display: flex; gap: 0.5rem; flex-wrap: wrap; margin: 1rem 0; }
+    form.inline { display: inline; }
+  </style>
+</head>
+<body>
+  <div class="brand">Paperwall</div>
+  <nav>
+    <a href="{{ url_for('index') }}">Status</a>
+    <a href="{{ url_for('settings_navidrome') }}">Navidrome</a>
+    <a href="{{ url_for('settings_weather') }}">Weather</a>
+    <a href="{{ url_for('settings_rotation') }}">Rotation</a>
+  </nav>
+  {% block content %}{% endblock %}
+</body>
+</html>