Gate.io Integration:
- Add Gate trader with full Trader interface implementation
- Add order_sync.go for background trade synchronization
- Fix quantity display (convert contracts to actual tokens via quanto_multiplier)
- Fix fill price return in OpenLong/OpenShort/CloseLong/CloseShort
- Add Gate-specific CoinAnk K-line data source support
- Add Gate to supported exchanges in frontend and backend
- Add Gate/KuCoin logo SVG icons
Trader Package Refactoring:
- Move exchange-specific code into subdirectories (binance/, bybit/, okx/, bitget/, hyperliquid/, aster/, lighter/, gate/)
- Create types/ package for shared types to avoid circular dependencies
- Move TraderTestSuite to trader/testutil package to avoid import cycles
- Update market.GetWithExchange to support exchange-specific data
- Change default MaxUsers from 5 to 10 in config
- Add update reminder section in install.sh output
- Add 'Keeping Updated' section in all README translations
- Remove individual exchange registration sections from all READMEs
- Remove redundant Binance, Hyperliquid, Aster DEX detailed setup sections
- Consolidate all exchange info into Supported Exchanges table with register links and setup guides
- Rename section to "Supported Exchanges (DEX/CEX Tutorials)" in respective languages
- Mark Bybit, OKX as supported in CEX section
- Mark Lighter as supported in Perp-DEX section
- Add Bybit API setup guide
- Add OKX API setup guide
- Add Lighter agent wallet setup guide
- Update all READMEs (EN, ZH-CN, JA, KO)