Add error message for json read

[lixin-wei]

the titile is all

[gemini-code-assist]

Summary of Changes

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This pull request significantly improves the diagnostic capabilities of the JSON reading functionality by providing more detailed error messages when parsing fails. It also adds a crucial validation step to prevent unsupported yyjson flags from being used, thereby increasing the robustness and clarity of the JSON parsing process.

Highlights

• Error Handling Improvement: Enhanced JSON parsing error messages by switching from yyjson_read to yyjson_read_opts. This allows the system to capture and report specific error details provided by the yyjson library, making debugging parsing failures much clearer.
• Input Flag Validation: Introduced an explicit check to prevent the use of the YYJSON_READ_INSITU flag. If this flag is set, an immediate error is returned, as in-situ parsing is not supported with the current const std::string_view input, ensuring predictable behavior.

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[gemini-code-assist]

Code Review

This pull request improves error reporting when parsing JSON by using yyjson_read_opts to get detailed error messages from the yyjson library.