[OneBot] Fix ForwardEntity cannot be serialized

[DarkRRb]

No description provided.

[Copilot]

Pull Request Overview

This pull request addresses serialization issues with ForwardEntity by updating conversion operators and expanding the MessagePack resolver support. Key changes include reordering resolver arguments in MessageRecord, adding nullable implicit operators for MessageChain in MessageRecord, and introducing a new MessageChainFormatter along with corresponding resolver updates.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
Lagrange.OneBot/Database/MessageRecord.cs	Updated implicit conversion operators to handle nullable types and revised resolver configuration.
Lagrange.OneBot/Database/MessageEntityResolver.cs	Renamed formatter variable and added a formatter for MessageChain serialization.
Lagrange.OneBot/Database/MessageChainFormatter.cs	Introduced a new formatter to enable MessageChain serialization via conversion through MessageRecord.

Comments suppressed due to low confidence (1)

Lagrange.OneBot/Database/MessageEntityResolver.cs:17

• Ensure that there are corresponding tests covering the new CHAIN_FORMATTER to verify proper serialization and deserialization of MessageChain.

if (typeof(T) == typeof(MessageChain)) return (IMessagePackFormatter<T>)CHAIN_FORMATTER;

[Copilot]

[nitpick] Consider adding an inline comment to explain the null-handling behavior in the implicit conversion operator for clarity.

Suggested change

	// Converts a nullable MessageChain to a nullable MessageRecord.
	// Returns null if the input chain is null; otherwise, creates a new MessageRecord.