Remove identity Solana relay

[raymondjacobson]

Summary

• remove identity-service's legacy Solana listen submission endpoint and Solana listen status endpoint
• remove identity-service's legacy wormhole/Solana relay route and Solana fee-payer maintenance surface
• delete the Solana listen instruction builder, Solana fee-payer helper, and Solana fee-payer funding script
• stop web/common from calling identity-service to record track listens
• remove relay-only Solana fee-payer and wormhole config from identity-service
• add a regression check that legacy identity Solana relay routes are not exposed

Context

A safe invalid POST to https://identityservice.audius.co/tracks/not-a-number/listen returned the route's validation error, confirming the public identity-service deployment still exposes the POST-only legacy listen route. That route could sign and submit old on-chain TrackListenInstruction transactions with identity-service fee payers.

This update now removes the broader identity-service Solana relay/fee-payer codepath as unused, including /wormhole_relay, /sol_balance_check, and the old fee-payer helper/funding script.

Verification

• eslint . --ext .ts,.js,.jsx,.tsx in packages/identity-service
• eslint src/services/audius-backend/AudiusBackend.ts in packages/common
• eslint src/common/store/social/tracks/recordListen.ts in packages/web
• node -c syntax checks for touched identity-service JS files
• git diff --check

Not Run

• Focused identity-service route test could not complete locally because Redis on localhost:6379 and Postgres on localhost:7433 were not running in this environment.

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Latest commit: 9502cf9

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