Refactor SignalR protocol type resolution logic
Removed SignalParams.SignalDataType and migrated type resolution to protocol headers using new WriteHeader/ReadHeader extensibility hooks. AyCodeBinaryHubProtocol now writes and reads the concrete data argument type in the message header, enabling correct deserialization of object-typed arguments. Updated AcBinaryHubProtocol to support header context and made relevant helpers protected. Cleaned up legacy SignalDataType logic and improved documentation.
.NET 9 core framework providing serialization (Binary, JSON, Toon), entity abstractions, database access, services, and shared utilities. Used as the foundation layer for AyCode applications.
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