v0.24.0:0 - configurable cluster topology (vllm container name, hide services, second-vllm monitor)

Make the cluster topology configurable so an adopter wired differently
(vLLM on both Sparks, port 8000, different container name, no Parakeet)
can monitor without forking. Covers the OpenClaw report P4/P5/#6.

- VLLM_CONTAINER override (default vllm_node), validated at the boundary
  and quote_arg-quoted into the swap log-tail + pre-flight validator exec.
- DISABLED_SERVICES list: hidden services show no tile and are skipped by
  status/deep-health/connectivity probes (kills the Parakeet-on-8000
  collision).
- kind: vllm custom service monitors a second Spark's vLLM via the shared
  probe_vllm_endpoint; /api/endpoints gains a disabled flag.

Swap mechanism intentionally not generalized to raw docker run (that's
coordination, roadmap item 4).

image/app/custom_services.py

@@ -10,6 +10,17 @@ Format:
         port: 8001
         health_path: /health
         image: nvcr.io/nim/nvidia/riva-multilingual:latest
+
+A `kind: vllm` entry monitors an additional vLLM on another Spark (read-only —
+the swap machinery only drives the primary Spark 1 vLLM). It gets a health tile
+probed via /v1/models plus container state and start/stop/restart:
+    custom:
+      - key: vllm-spark2
+        kind: vllm
+        host: <spark-2-ip>
+        user: <ssh-user>
+        container: vllm_node
+        port: 8000
 """
 from __future__ import annotations
 import os