feat: dune-platform-volume harness + trading-apps hub overhaul

[Flotapponnier]

Summary

• New harness harnesses/dune-platform-volume/ queries Sacha's (adam_tehc) Dune community datasets for cross-chain trading platform volume instead of Mobula lighthouse byPlatform
• Bench 201 updated: metric renamed to dune_platform_volume_24h_usd, source updated, BasedBot added as new provider
• trading-apps hub: adds Terminal (Padre), BasedBot, updates volume tooltip + footer, restores pump.fun volume (now properly pumpapp-only)

Datasets discovered and confirmed

Platform	Dataset	Chains
GMGN	dataset_gmgn_daily	sol, bnb, robinhood, base, eth, xlayer, hyperevm, monad, megaeth
Axiom	dataset_axiom_daily	sol $150M, robinhood, bnb, eth
Trojan	dataset_trojan_daily	sol only
Terminal	dataset_terminal_daily	sol, robinhood, base, bnb
Photon	dataset_photon_daily	sol only
BasedBot	dataset_basedbot_daily	robinhood, bnb, base, sol, eth, hyperevm
pump.fun	dataset_pumpapp_sol_daily + dataset_pumpfun_relay_daily	sol + relay
fomo	dataset_fomo_sol_daily	sol only

Dune query

Query ID 8400444 tested and returns clean data for all 8 platforms. Set DUNE_QUERY_ID=8400444 + DUNE_API_KEY on VPS to deploy.

Deployment (VPS)

After merge to dev, run on ocb-par-main:

cd /opt/ocb
docker build --no-cache -t ocb-dune-platform-volume harnesses/dune-platform-volume/
docker stop ocb-dune-platform-volume 2>/dev/null; docker rm ocb-dune-platform-volume 2>/dev/null
docker run -d --name ocb-dune-platform-volume \
  -e DUNE_API_KEY=<key> \
  -e DUNE_QUERY_ID=8400444 \
  -p 9201:2112 \
  --restart unless-stopped \
  ocb-dune-platform-volume

Then add scrape target to prometheus.yml.

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