Add Varaverk plugin scaffold (PHP, unRAID native)

Plugin lives in Plugin/ — invisible to User Script Plugin.
dev_install.sh symlinks into /usr/local/emhttp/plugins/varaverk/ for development.

Pages: Monitor (5s poll), Scheduler (orchs + Advanced children, toggle + cron),
Config (raw editor, host-aware file access), Docs (markdown + live $VAR substitution).

API endpoints: monitor.php (JSON), scheduler.php (writes schedule.json + cron.d),
config.php (writes conf files with host permission check).

Includes: config.php (parser, host detection, var map), scheduler.php (job tree,
cron.d rebuild), monitor.php (docker, GPU, resources, fallback, transcode),
docs.php (file tree, var substitution, Parsedown renderer).

Plugin/usr/local/emhttp/plugins/varaverk/css/varaverk.css

@@ -0,0 +1,96 @@
+/* Varaverk plugin styles — inherits unRAID theme, adds plugin-specific layout */
+
+#varaverk-wrap { padding: 10px; font-family: inherit; }
+
+/* Tab bar */
+#vv-tabs { display: flex; gap: 4px; margin-bottom: 16px; border-bottom: 2px solid #444; }
+.vv-tab  { padding: 6px 16px; text-decoration: none; color: #aaa; border-radius: 4px 4px 0 0; }
+.vv-tab:hover { color: #fff; background: #333; }
+.vv-tab.active { color: #fff; background: #555; border-bottom: 2px solid #fff; }
+
+/* Cards / layout */
+.vv-row  { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
+.vv-card { flex: 1; min-width: 200px; background: #1e1e1e; border: 1px solid #444;
+           border-radius: 6px; padding: 12px; }
+.vv-wide { flex: 100%; }
+.vv-card h3 { margin: 0 0 10px; font-size: 13px; text-transform: uppercase;
+              color: #888; letter-spacing: 0.05em; }
+
+/* Fallback state badge */
+.vv-state-badge { font-size: 20px; font-weight: bold; padding: 4px 0; }
+.vv-state-normal    { color: #4caf50; }
+.vv-state-failover  { color: #f44336; }
+.vv-state-no_internet { color: #ff9800; }
+.vv-state-dark      { color: #9e9e9e; }
+.vv-state-unknown   { color: #666; }
+
+/* Docker table */
+#vv-docker-table { width: 100%; border-collapse: collapse; font-size: 13px; }
+#vv-docker-table th { text-align: left; padding: 4px 8px; color: #888;
+                      border-bottom: 1px solid #444; }
+#vv-docker-table td { padding: 4px 8px; border-bottom: 1px solid #2a2a2a; }
+.vv-status-up   { color: #4caf50; }
+.vv-status-down { color: #f44336; }
+
+/* Scheduler */
+#vv-scheduler { max-width: 900px; }
+.vv-hint { color: #888; font-size: 13px; margin-bottom: 16px; }
+.vv-job  { margin-bottom: 4px; }
+.vv-orch { background: #1e1e1e; border: 1px solid #444; border-radius: 6px;
+           padding: 10px 12px; margin-bottom: 8px; }
+.vv-script { background: #161616; border: 1px solid #333; border-radius: 4px;
+             padding: 6px 10px; margin: 4px 0; margin-left: 20px; }
+.vv-job-row { display: flex; align-items: center; gap: 10px; }
+.vv-job-label { flex: 1; font-size: 14px; }
+.vv-cron { width: 160px; background: #111; border: 1px solid #444; color: #ddd;
+           padding: 4px 8px; border-radius: 4px; font-family: monospace; font-size: 13px; }
+.vv-children { padding-top: 6px; }
+.vv-advanced-toggle { background: none; border: 1px solid #555; color: #aaa;
+                      padding: 2px 8px; border-radius: 4px; cursor: pointer; font-size: 12px; }
+.vv-advanced-toggle:hover { border-color: #888; color: #fff; }
+
+/* Toggle switch */
+.vv-toggle { position: relative; display: inline-block; width: 36px; height: 20px; flex-shrink: 0; }
+.vv-toggle input { opacity: 0; width: 0; height: 0; }
+.vv-slider { position: absolute; inset: 0; background: #444; border-radius: 20px; cursor: pointer;
+             transition: 0.2s; }
+.vv-slider:before { content: ''; position: absolute; width: 14px; height: 14px; left: 3px; bottom: 3px;
+                    background: #fff; border-radius: 50%; transition: 0.2s; }
+.vv-toggle input:checked + .vv-slider { background: #4caf50; }
+.vv-toggle input:checked + .vv-slider:before { transform: translateX(16px); }
+
+/* Config editor */
+#vv-conf-tabs { display: flex; gap: 4px; margin-bottom: 8px; }
+.vv-conf-tab  { padding: 4px 12px; text-decoration: none; color: #aaa;
+                border: 1px solid #444; border-radius: 4px; font-size: 13px; }
+.vv-conf-tab.active { color: #fff; background: #333; border-color: #666; }
+#vv-conf-editor { width: 100%; min-height: 500px; background: #111; color: #ddd;
+                  border: 1px solid #444; padding: 12px; font-family: monospace;
+                  font-size: 13px; line-height: 1.5; border-radius: 4px; box-sizing: border-box; resize: vertical; }
+#vv-conf-actions { margin-top: 8px; display: flex; align-items: center; gap: 10px; }
+#vv-conf-actions button { padding: 6px 18px; background: #4caf50; border: none;
+                          color: #fff; border-radius: 4px; cursor: pointer; font-size: 14px; }
+#vv-conf-actions button:hover { background: #388e3c; }
+#vv-conf-status { font-size: 13px; color: #aaa; }
+
+/* Docs */
+#vv-docs { display: flex; gap: 16px; }
+#vv-docs-sidebar { width: 220px; flex-shrink: 0; }
+#vv-docs-sidebar h3 { font-size: 12px; text-transform: uppercase; color: #888; margin: 0 0 8px; }
+#vv-docs-sidebar ul { list-style: none; padding: 0; margin: 0; }
+#vv-docs-sidebar li { margin: 2px 0; }
+#vv-docs-sidebar a { display: block; padding: 3px 8px; font-size: 12px; color: #aaa;
+                     text-decoration: none; border-radius: 3px; }
+#vv-docs-sidebar a:hover { background: #222; color: #fff; }
+#vv-docs-sidebar a.active { background: #333; color: #fff; }
+#vv-docs-content { flex: 1; min-width: 0; }
+.vv-doc-body { background: #1a1a1a; border: 1px solid #444; border-radius: 6px;
+               padding: 20px; line-height: 1.7; }
+.vv-doc-body h1, .vv-doc-body h2, .vv-doc-body h3 { color: #ddd; }
+.vv-doc-body code { background: #111; padding: 1px 5px; border-radius: 3px; font-size: 12px; }
+.vv-doc-body pre { background: #111; padding: 12px; border-radius: 4px; overflow-x: auto; }
+.vv-doc-hint { font-size: 12px; color: #666; margin-top: 8px; }
+
+/* Live var substitution colours */
+code.vv-live-var    { color: #4caf50; background: #0d1f0d; }
+code.vv-unknown-var { color: #ff9800; background: #1f130d; }