enhancement: integrate RPC node fallback logic in public client

[devmocrea]

Description

Implement an automated RPC endpoint fallback mechanism in publicClient configurations to ensure high application availability.

Technical Specification

• Update the public client configuration in apps/web/src/lib/susuchain-celo.ts.
• Use viem's fallback() transport:
  transport: fallback([http('https://forno.celo.org'), http('https://celo-mainnet.infura.io/v3/YOUR-KEY')])
• Apply similar fallback configurations to the Stacks network options.

Acceptance Criteria

• Frontend seamlessly falls back to the secondary RPC node if the primary node goes offline.