Varaverk: FallBack + Watchdog tabs; plugin path restructure to Plugin/unraid/

- FallBack tab: per-node tier inventory + active fallback card with duration, tier, handback strikes, running container status
- Watchdog tab: live system health (RAM bar + thresholds, load, uptime, daemon), docker watchdog strikes + skip list + restart history, stability strikes + reboot log, resource pressure alert card, config inventory (mem limits, required, pause/stop lists)
- Swapped partnership/arrs tab order; FallBack between partnership and watchdog
- Plugin source tree moved from Plugin/usr/local/emhttp/plugins/varaverk/ to Plugin/unraid/
- Deployment/ conf templates added

Plugin/unraid/api/flag_toggle.php

@@ -0,0 +1,14 @@
+<?php
+header('Content-Type: application/json');
+require_once dirname(__DIR__) . '/include/scheduler.php';
+
+$name    = trim($_POST['name']    ?? '');
+$enabled = ($_POST['enabled'] ?? '0') === '1';
+
+if (!$name || !preg_match('/^[A-Z_]+_RSYNC_ENABLED$/', $name)) {
+    echo json_encode(['ok' => false, 'error' => 'Invalid flag name']);
+    exit;
+}
+
+$ok = vv_conf_flag_set($name, $enabled);
+echo json_encode(['ok' => $ok, 'error' => $ok ? null : 'Failed to write master.conf']);