fix: drop dead RPC providers + add wave 7 chain pages

[Flotapponnier]

Summary

• Add wave 7 chain hub pages (fantom, kusama, hydration, zetachain, haqq, etherlink, chiliz, wemix, songbird, etc-classic, telos, pulsechain, warden, oraichain, peaq)
• Remove dead RPC providers across 14 chains: DNS failures, 404s, paid-plan blocks, persistent 500s
• Suspend hydration bench (all 5 providers unreachable)
• Fix seo_intro/faq text to reflect accurate provider counts

Providers removed

Chain	Provider	Reason
songbird	ftso-au	DNS dead
zetachain	blockpi, allthatnode	404 / DNS dead (1 provider left: Thirdweb)
telos	telos-official	404 (drpc remains)
canto	drpc, publicnode, ankr	404 / 403 (canto-official remains)
aurora	ankr	403 API key required
kaia	drpc	paid plan only
xdc	drpc	paid plan only
tron	drpc	method not available
ethereum	cloudflare, gatewayfm	JSONRPC -32603 / 503 persistent
astar	publicnode, blastapi	404 / DNS dead
moonriver	unitedbloc	DNS dead
sei	drpc	persistent 500
ronin	drpc	persistent 500
hydration	all 5	DNS dead or HTTP 400 → suspended
warden/chiliz	drpc	404 Not Found

After merge

Rebuild the rpc-capabilities harness on Railway so it stops probing removed endpoints. UNRESPONSIVE badges will clear within 24h once Prometheus data rolls off.