merge dispatch and deploy into a single deploy.sh

deploy.sh reads SSH_ORIGINAL_COMMAND directly, validates it, and
runs the deploy. No more dispatch indirection.

scripts/deploy.sh

@@ -1,6 +1,14 @@
 #!/bin/bash
 set -euo pipefail
-APP="${1#deploy-}"
+
+CMD="${SSH_ORIGINAL_COMMAND:-${1:-}}"
+
+if ! [[ "$CMD" =~ ^deploy-[a-zA-Z0-9._-]+$ ]]; then
+    echo "Unknown command: $CMD"
+    exit 1
+fi
+
+APP="${CMD#deploy-}"
 cd /opt/hantim
 git pull
 cd "docker/$APP"