refactor(docs): co-locate k8s/proxmox docs with their code + fix broken perf paths

Docs moved from docs/k8s -> k8s/docs and docs/proxmox -> proxmox/docs to sit
beside their code. Updated all cross-references (docmap, STATUS, README, AGENTS,
k8s README). Fixed SCRIPT_DIR path resolution in 3 perf scripts broken by the
reorg (deploy-check/and-fix/finish-host pointed at root/scripts instead of
perf/scripts). Registered the new top-level proxmox/ dir in all listings.

💘 Generated with Crush

Assisted-by: Crush:glm-5.2

perf/finish-host.sh

@@ -22,7 +22,7 @@ if [ -z "$HOST" ]; then
 fi
 
 SSH_OPTS=(-o BatchMode=yes -o ConnectTimeout=8 -o ServerAliveInterval=10 -o StrictHostKeyChecking=accept-new)
-SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)/scripts"
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/scripts"
 
 echo "==================================================================="
 echo " finish-host.sh — $HOST  (mode: $MODE)"