feat(multinode): wire gorilla-merger into the ASAP arms (#32)

[zzylol]

Summary

• Runs asap-gorilla-merger (Thanos-Receive-style) on node2 in the ASAP arms of the mvp-multinode demo: HTTP fragment ingest :10908, Thanos StoreAPI :10907 over the <2h pending window, 2h-block shipper into the asap-gorilla-tsdb bucket the store-gateway already watches (configs/shared/thanos-objstore.yaml). External labels cluster=asap-mvp,merger=m1.
• Add batch/window modes, support sketch/raw SDK collection and benchmarking #32 — StoreAPI fan-out: thanos-query gets a second --endpoint=gorilla-merger:10907 alongside --endpoint=thanos-store-gateway:10901, so query unions the merger's recent <2h window with the store-gateway's >=2h S3 blocks (merger drops local blocks once shipped → no double-count).
• Adds the gorilla-merger:NODE2_IP add-host alias, the data/gorilla-merger tsdb volume dir, and asap/gorilla-merger:dev to the image distribution set + README image table.

#24 gap (documented, not fabricated)

There is no cold.ship_endpoint key anywhere in this repo, and no edge agent path produces an HTTP ASAPFRG1 fragment ship today. The current edge cold tier is the gorillas3 OTel processor writing Prometheus TSDB blocks directly to MinIO (block_format: prometheus_tsdb, tsdb_bucket: asap-gorilla-tsdb); its agent role emits fragment metrics downstream through the OTel pipeline, not an HTTP POST. So the merger's ingest port has no producer in the deploy yet. The README spells out the two options to close #24 (an ASAPFRG1 HTTP exporter, or a gateway_fragment sidecar that re-POSTs). The StoreAPI fan-out side is live and queryable; end-to-end edge→merger→query validation is blocked on the producer side only.

Notes

• asap/gorilla-merger:dev is built by /mydata/asap-build-all.sh (host script, updated locally — not in this repo) from ASAPQuery-backend/gorilla-merger/Dockerfile (PR build(gorilla-merger): containerize via BuildKit secret (unblocks #310 CI) ASAPQuery-backend#312).
• bash -n clean on run_demo.sh + topology.env.

Test plan

• Build asap/gorilla-merger:dev (needs the gh_token BuildKit secret) and docker save | ssh load it to the nodes.
• run_demo.sh up asap → confirm asap-gorilla-merger is up on node2, StoreAPI reachable, and thanos-query lists it as a healthy store (/api/v1/stores).
• (Blocked on CountminSKetch Tumbling Window #24) exercise POST /ingest/gorilla from an edge producer and confirm the samples surface through thanos-query.

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