The function lives in client.py but was missing from the package
__init__, unlike its neighbours clear_all_cache and clear_server_cache.
The monitoring worker imports it from app.proxmox inside a try/except
ImportError, so nothing crashed — the hourly job was silently skipped
with "Proxmox cache cleanup not available" and the connection cache was
never pruned, keeping entries older than an hour alive until restart.
Interactive infrastructure map (panel -> cluster -> node -> guest) rendered
with React Flow, backed by a single aggregated /api/network/topology endpoint
instead of fanning out over servers/nodes/SDN/VMs. Adds a netN NIC parser for
QEMU/LXC guest configs, status/threshold filters, canvas tools, and PNG/SVG
export.
