Show reclaimable buff/cache as a distinct amber segment between used
(green) and free (gray) in the memory bar. This explains why Pulse's
memory percentage differs from Proxmox: Pulse reports cache-aware
usage (MemAvailable) while Proxmox includes cache as used (Total-Free).
Backend: add Cache field to Memory model, derived from MemInfo
(Available - Free). Only uses MemInfo.Free (not FreeMem fallback) to
avoid inflating cache by the balloon gap on ballooned VMs.
Frontend: StackedMemoryBar renders three segments with tooltip
breakdown. Tooltip Free accounts for balloon limit when active.
Percentage label and alerts remain cache-aware (unchanged).
rcourtman
7dab977d91