Show memory and disk capacity (used/total) on dashboard tiles

Previously the Mem/Disk bars only showed a percentage. Plumbed the
underlying byte totals through the whole stack -- collectors, DB
(with a migration for the already-deployed CT122 instance), API, and
the web tile -- so each card also shows e.g. "19.6/32.0 GB".

Verified end-to-end with a throwaway local instance (seeded snapshot,
logged in, screenshotted the rendered tile).

Note: the SSH-collected hosts (omv, ripper) assume the remote
monitor-readonly.sh script emits raw bytes for MEMLINE/DISK_, matching
Proxmox's convention -- unverified since that script only lives on
those two hosts, not in this repo.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/api/src/routes/hosts.ts

@@ -27,6 +27,10 @@ export function registerHostRoutes(app: FastifyInstance, db: Database.Database):
         cpuPct: r.cpu_pct,
         memPct: r.mem_pct,
         diskPct: r.disk_pct,
+        memTotalBytes: r.mem_total_bytes,
+        memUsedBytes: r.mem_used_bytes,
+        diskTotalBytes: r.disk_total_bytes,
+        diskUsedBytes: r.disk_used_bytes,
         memPressurePct: r.mem_pressure_pct,
         cpuPressurePct: r.cpu_pressure_pct,
         uptimeSec: r.uptime_sec,