- Update mpc-service migration to match new gateway mode schema (mpc_wallets, mpc_shares)
- Remove old MySQL migrations (party_shares, session_states, share_backups)
- Fix MpcSignature type to use string format (64 bytes hex: R + S)
- Add persistence layer conversion functions for DB compatibility
- Fix method names in domain services (checkDeviceNotRegistered, generateNextUserSequence)
- Update wallet generator interface to use delegateShare instead of clientShareData
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>