Add PulseChain RPC discovery fallbacks

[PatoSuave]

Summary

Adds hosted PulseChain approval-discovery resilience without migrating wallet/browser RPCs or revoke execution:

• Keeps PulseScan as the primary approval-history source.
• Uses server-only Dwellir RPC as the preferred eth_getLogs fallback.
• Uses OtherScan RPC as a final server-only fallback.
• Leaves wagmi/browser RPCs, lifeboat RPC defaults, and wallet-signed revoke gates unchanged.

Environment

• PULSECHAIN_DISCOVERY_RPC_URL is documented as the preferred server-only Dwellir fallback.
• PULSECHAIN_OTHERSCAN_RPC_URL is documented as an optional server-only override, defaulting to OtherScan RPC.
• No authenticated RPC URL is committed or exposed through NEXT_PUBLIC_*.
• Vercel Preview and Production have encrypted PULSECHAIN_DISCOVERY_RPC_URL configured.

Validation

• npm test
• npm run typecheck
• npm run lint
• npm run security:env
• git diff --check
• Dwellir CLI catalog confirms Pulsechain Mainnet Archive endpoint.
• OtherScan RPC probe returned PulseChain chain ID 0x171.
• Secret scan found no real Dwellir URL in committed files.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
revoke-pls	Ready	Preview, Comment	Jul 3, 2026 6:31pm