Subnets previously lived only under Settings, easily confused with the Network
Devices asset list. Add a front-facing browse + detail:
- Nav: rename "Network" -> "Network Devices"; add "View Networks" (subnets), both
under Assets (network plugin get_navigation_items; frontend fallback matched).
- /networks (SubnetsBrowse): all subnets with name / CIDR / type / VLAN / notes,
searchable, row-click to detail.
- /networks/:id (SubnetDetail): the subnet (CIDR, network address, type, VLAN,
gateway, notes) plus the network devices whose primary IP falls inside its
CIDR - get_subnet now computes that membership in Python (a device's IP lives
in a Communication row, so it is not a plain SQL join).
Verified on the import DB: 37 networks list (real WJ subnets), detail renders.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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