feat(sdk): Add comprehensive examples for C, C++, C#, and Ruby SDKs
Add example code demonstrating all SDK services (Crypto, DEX, ZK, IBC,
Compiler) for the remaining languages:
- C SDK (5 examples): Using synor_* C API with explicit memory management
- C++ SDK (5 examples): Modern C++17 with RAII and designated initializers
- C# SDK (5 examples): Async/await patterns with .NET conventions
- Ruby SDK (5 examples): Ruby idioms with blocks and symbols
Each example covers:
- Crypto: Hybrid signatures, mnemonics, Falcon, SPHINCS+, KDF, hashing
- DEX: Markets, spot trading, perpetuals, liquidity, portfolio
- ZK: Circuits, Groth16, PLONK, STARK, recursive proofs, ceremonies
- IBC: Chains, channels, transfers, packets, relayer, monitoring
- Compiler: Compilation, optimization, ABI, analysis, validation, security
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