fix: syslog coverage count exceeding device total + remove decorative live indicator (v0.11.1 Beta)

- aggregateRules/aggregateActions: deduplicate coverage per device using a per-device seenKeys set,
  preventing a device with duplicate topic|action rules from inflating the coverage count above total
- executePush (add path): skip devices that already have an identical rule/action before pushing to
  all devices, preventing duplicate RouterOS logging entries from being created in the first place
- TopBar: remove hardcoded decorative 'live' indicator that had no backend connection logic

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "mikrotik-manager-backend",
-  "version": "0.11.0-beta",
+  "version": "0.11.1-beta",
   "description": "Mikrotik Network Management Platform - Backend API",
   "main": "dist/index.js",
   "scripts": {