feat: complete Phase 3 SDKs for Swift, C, C++, C#, and Ruby
Implements Database, Hosting, and Bridge SDKs for remaining languages:
Swift SDKs:
- SynorDatabase with KV, Document, Vector, TimeSeries stores
- SynorHosting with domain, DNS, deployment, SSL operations
- SynorBridge with lock-mint and burn-unlock cross-chain flows
C SDKs:
- database.h/c - multi-model database client
- hosting.h/c - hosting and domain management
- bridge.h/c - cross-chain asset transfers
C++ SDKs:
- database.hpp - modern C++17 with std::future async
- hosting.hpp - domain and deployment operations
- bridge.hpp - cross-chain bridge with wait operations
C# SDKs:
- SynorDatabase.cs - async/await with inner store classes
- SynorHosting.cs - domain management and analytics
- SynorBridge.cs - cross-chain with BridgeException handling
Ruby SDKs:
- synor_database - Struct-based types with Faraday HTTP
- synor_hosting - domain, DNS, SSL, analytics
- synor_bridge - lock-mint/burn-unlock with retry logic
Phase 3 complete: Database/Hosting/Bridge now available in all 12 languages.
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