Add ETH Key Support to Reconnection Service

[p5150j]

Description

Update the reconnection service to support Ethereum keys and signatures for seamless user reconnection.

Tasks

• Modify reconnection service to recognize ETH keys
• Update signature verification to support ETH formats
• Implement ETH address handling in reconnection flows
• Update error handling for ETH-specific cases
• Test reconnection flows with ETH keys

Acceptance Criteria

• Reconnection service successfully handles ETH keys
• Users can reconnect using ETH signatures
• Appropriate error messages for ETH-specific failures
• No degradation in reconnection success rates
• Documentation updated to reflect ETH key support
• Comprehensive test suite for ETH reconnection flows