feat(nav): surface AP Groups page; always-fresh device data on edit pages

The AP Groups page (ApGroups.vue + ApGroupController + UnifiApiClient
CRUD methods) has been built but never declared in composer.json's
pages list, so it was hidden from the menu. Added it at sort_order=6,
between WiFi Networks and Portal.

The WiFi Networks page already has per-SSID AP-group assignment via
the existing updateApGroups route — that wires into UniFi's standard
ap_group_ids field on wlanconf. (UniFi doesn't expose per-AP-only
assignment separately; the convention is "make a one-AP group for
this AP and assign the SSID to it.")

For the "always pull from UniFi on load" guarantee:
- getWlans() and getApGroups() are already uncached — fresh on every
  page load
- getDevices() (feeds the AP picker for group membership) is cached
  for unifi.cache_ttl seconds; both ApGroupController::index and
  WifiController::index now Cache::forget('unifi:devices') before
  reading so the device list is always fresh

v1.3.0.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

composer.json

@@ -1,7 +1,7 @@
 {
     "name": "dashboard/unifi",
     "description": "UniFi network management, WiFi stats, and captive portal authentication for the Dashboard platform",
-    "version": "1.0.0",
+    "version": "1.3.0",
     "type": "library",
     "license": "MIT",
     "autoload": {
@@ -27,8 +27,9 @@
                 { "label": "Devices",          "route_name": "unifi.devices",          "icon": "cpu-chip",         "permission": "unifi.stats",    "sort_order": 3 },
                 { "label": "Clients",          "route_name": "unifi.clients",          "icon": "users",            "permission": "unifi.stats",    "sort_order": 4 },
                 { "label": "WiFi Networks",    "route_name": "unifi.wifi",             "icon": "wifi",             "permission": "unifi.manage",   "sort_order": 5 },
-                { "label": "Portal",           "route_name": "unifi.portal.settings",  "icon": "shield-check",     "permission": "unifi.auth",     "sort_order": 6 },
-                { "label": "Webhooks",         "route_name": "unifi.webhooks.index",   "icon": "bell-alert",       "permission": "unifi.settings", "sort_order": 7 },
+                { "label": "AP Groups",        "route_name": "unifi.ap-groups.index",  "icon": "rectangle-stack",  "permission": "unifi.manage",   "sort_order": 6 },
+                { "label": "Portal",           "route_name": "unifi.portal.settings",  "icon": "shield-check",     "permission": "unifi.auth",     "sort_order": 7 },
+                { "label": "Webhooks",         "route_name": "unifi.webhooks.index",   "icon": "bell-alert",       "permission": "unifi.settings", "sort_order": 8 },
                 { "label": "Settings",         "route_name": "unifi.settings",         "icon": "cog-6-tooth",      "permission": "unifi.settings", "sort_order": 99 }
             ],
             "permissions": [