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/clearlock.php

@@ -0,0 +1,14 @@
+<?php
+header('Content-Type: application/json');
+if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
+    echo json_encode(['ok' => false, 'error' => 'POST only']);
+    exit;
+}
+$file = basename($_POST['file'] ?? '');
+if (!$file || !preg_match('/^[a-zA-Z0-9_\-]+\.lock$/', $file)) {
+    echo json_encode(['ok' => false, 'error' => 'Invalid filename']);
+    exit;
+}
+$path = '/tmp/unraid_locks/' . $file;
+if (file_exists($path)) @unlink($path);
+echo json_encode(['ok' => true]);