feat(ui): navigation reorganization — consolidate duplicate pages, grouped sidebar (v0.16.4-beta)

UI/UX consolidation pass to reduce nav sprawl (~24 destinations -> ~17):

- Merge Router Settings + Switch Settings (copy-paste duplicates) into one
  Network Services > Discovery & SNMP page with an All/Routers/Switches
  scope selector; LLDP + SNMP status tables merge both fleets with a
  type pill, apply fans out per scope
- Retire Routers/Switches overview pages; the Devices type filter now
  lives in the URL (?type=AP|SW|RTR) and legacy routes redirect to the
  pre-filtered view. Wireless overview kept (RF Health / Rogue APs are
  unique content)
- Fold Wireless Clients into Clients: All/Wired/Wireless segmented
  filter (URL-synced); wireless view swaps the Type column for SSID +
  signal quality columns
- Regroup sidebar into Monitor / Network / Services / Operations
  sections; Devices and Wireless are collapsible groups (auto-open on
  active section, manual collapse always wins); Wireless group renders
  only when wireless APs exist
- Rename Syslog -> Logging with a cross-link to live Events; group the
  Settings tabs into Platform / My Account / Fleet sections
- Legacy routes (/routers, /switches, /routers/settings,
  /switches/settings, /wireless/clients) redirect so bookmarks keep
  working

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

backend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "mikrotik-manager-backend",
-  "version": "0.16.3-beta",
+  "version": "0.16.4-beta",
   "description": "Mikrotik Network Management Platform - Backend API",
   "main": "dist/index.js",
   "scripts": {