Enrich alarms with device names for Loki logs

Added device name enrichment to alarms so that Loki logs show
human-readable device names instead of just MAC addresses.

Changes:
- Modified collectAlarms to fetch devices and build MAC-to-name lookup
- Added extractDeviceNameFromAlarm helper to extract MAC addresses from
  alarm messages and lookup corresponding device names
- Device names are extracted from messages like "AP[fc:ec:da:89:a6:91]"
  or from SrcMAC/DstMAC fields
- Added go.mod replace directive to use local unifi library with new
  DeviceName field

The device_name field will now be included in the JSON output sent to
Loki, making it easier to identify which device triggered an alarm.

Fixes #415

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

go.sum

@@ -77,8 +77,6 @@ github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
 github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
-github.com/unpoller/unifi/v5 v5.6.0 h1:qryEAJNYXG/WbjIqrIEZ/npRNBwHTsv/ZFbseYry8ug=
-github.com/unpoller/unifi/v5 v5.6.0/go.mod h1:vSIXIclPG9dpKxUp+pavfgENHWaTZXvDg7F036R1YCo=
 github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
 go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
 go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=