ready: chore/implement smartFallbackTransport

[Sharqiewicz]

Summary

• Implement smart RPC fallback transport for EVM networks with automatic retry and exponential backoff
• Add timeout and retry mechanism for Substrate API connections during ramp registration
• Simplify EvmClientManager by moving retry logic to transport level
• Configure fallback public RPCs for all supported EVM chains in wagmi config

Test plan

• Test offramp flow with primary RPC disabled (simulate network failure)
• Verify fallback to secondary RPC endpoints works correctly
• Test Substrate connection timeout handling during registration
• Confirm existing ramp flows work without regression
• Check console logs for proper retry attempt logging

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