fix(perf): bench jq direction bug + libaio + json note guard [#709]

- write tests read .write.* explicitly (jq // kept read=0 for writes)
- libaio1 installed everywhere (real aio engine, no sync cap)
- fio stdout notes stripped before jq parse

Ticket: https://projects.knownelement.com/issues/709

proxmox/perf/bench/lxc-bench-setup.sh

@@ -33,8 +33,10 @@ trap cleanup EXIT
 TPL=$(pveam list local 2>/dev/null | grep -oE 'local:vztmpl/[a-z0-9-]*debian-12-standard[^ ]*\.tar\.zst' | head -1 || true)
 if [ -z "$TPL" ]; then
     pveam update >/dev/null
-    pveam download local debian-12-standard_12.7-1_amd64.tar.zst >/dev/null
-    TPL=$(pveam list local | grep -oE 'local:vztmpl/[a-z0-9-]*debian-12-standard[^ ]*\.tar\.zst' | head -1)
+    DL=$(pveam available --section system 2>/dev/null | grep -oE 'debian-12-standard[^ ]*\.tar\.zst' | sort -V | tail -1)
+    [ -n "$DL" ] || { echo "[bench-lxc] ERROR: no debian-12 LXC template in pveam" >&2; exit 1; }
+    pveam download local "$DL" >/dev/null
+    TPL=$(pveam list local | grep -oE "local:vztmpl/$DL" | head -1)
 fi
 echo "[bench-lxc] template: $TPL"
 
@@ -50,7 +52,7 @@ pct start "$CTID"
 sleep 5
 
 # toolset in (same installer the guests use; piped in, nothing fetched from outside)
-pct exec "$CTID" -- bash -c "export DEBIAN_FRONTEND=noninteractive; apt-get update -qq >/dev/null; apt-get install -y -qq fio iperf3 jq >/dev/null"
+pct exec "$CTID" -- bash -c "export DEBIAN_FRONTEND=noninteractive; apt-get update -qq >/dev/null; apt-get install -y -qq fio iperf3 jq libaio1 >/dev/null"
 
 BDIR="/mnt/bench"
 [ -z "$STORE" ] && BDIR="/var/tmp"