feat(sdk): implement DEX SDK with perpetual futures for all 12 languages
Complete decentralized exchange client implementation featuring:
- AMM swaps (constant product, stable, concentrated liquidity)
- Liquidity provision with impermanent loss tracking
- Perpetual futures (up to 100x leverage, funding rates, liquidation)
- Order books with limit orders (GTC, IOC, FOK, GTD)
- Yield farming & staking with reward claiming
- Real-time WebSocket subscriptions
- Analytics (OHLCV, trade history, volume, TVL)
Languages: JS/TS, Python, Go, Rust, Java, Kotlin, Swift, Flutter,
C, C++, C#, Ruby
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