The UI had no way to add a device. Adds an admin-only Add device dialog
(IPv6/IPv4 addresses, SNMP v1/v2c/v3, synchronous discovery, reattach 409
flow) and a device-page Actions menu (Edit with parents and SNMP
replacement, Rediscover now, Retire). Purge now requires typing the name.
API: POST /api/v1/devices/{slug}/retire (admin, audited, 409 if already
retired). OpenAPI change is additive.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Lx9FNLG2CqeBbVGGd9bFsP
jleung
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