[FEATURE] [Coinswap] Migrate Maker RPC to mill-rpc

[hulxv]

Description

Migrate the Maker RPC server from current implementation to mill-rpc framework.

Motivation

After successful Taker migration, migrate Maker to complete the transition.

Proposed Solution

• Apply lessons learned from Taker migration
• Use same migration process
• More complex than Taker (additional endpoints)

Tasks

• Create new MakerRpcServer using mill-rpc
• Port all Maker endpoints
• Add compute pool for crypto operations
• Add middleware
• Port tests
• Run benchmarks
• Side-by-side testing
• Deploy to testnet

Expected

• Full feature parity with existing Maker RPC
• Performance improvements
• Enhanced security
• Cleaner codebase