chore: sync dev to main — wave-6 RPC slug alignment

[Flotapponnier]

Summary

• Aligns all 12 wave-6 RPC bench YAMLs with the Prometheus provider labels emitted by config.go
• Drops dead providers (dRPC for vana/gravity, publicnode/lavenderfive/autostake for Cosmos chains, harmony-official/ankr/blastapi, iotex non-mirror providers)
• Updates all provider counts and text references to match live Prometheus data
• Trims config.go to remove probes that 404/error from Railway datacenter IPs

Chains fixed (AWAITING → LIVE)

gravity-rpc, harmony-rpc, iotex-rpc, vana-rpc, reya-rpc, oasis-emerald-rpc, oasis-sapphire-rpc, nibiru-rpc, nolus-rpc, persistence-rpc, quicksilver-rpc, regen-rpc

Verification

All 12 bench JSON files confirmed live with real latency data on VPS (/data/state/aggregate/benches/). seoDescription templates resolved to actual provider names and millisecond values.

Test plan

• All 12 bench pages render with real data (not AWAITING)
• materialize-worker rebuilt on ocb-par-main with new code (commit 9dfa382)
• No quorum-fail logs for any of the 12 chains