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/js/varaverk.js

@@ -0,0 +1,9 @@
+// Varaverk — shared JS utilities
+// Page-specific JS lives inline in each page partial.
+
+// Flash a status element briefly then fade
+function vvFlashStatus(el, msg, ok) {
+  el.textContent = msg;
+  el.style.color = ok ? '#4caf50' : '#f44336';
+  setTimeout(() => { el.textContent = ''; }, 3000);
+}