docs(dotnet): dotnet connector supports blob data type

[YamingPei]

Description

dotnet connector supports blob data type.

Issue(s)

• Close https://project.feishu.cn/taosdata_td/feature/detail/6663148353

Checklist

Please check the items in the checklist if applicable.

• Is the user manual updated?
• Are the test cases passed and automated?
• Is there no significant decrease in test coverage?

[gemini-code-assist]

Code Review

This pull request updates the C# connector documentation in both English and Chinese to include the BLOB data type mapping to byte[] and its associated limitations. A review comment suggests capitalizing 'BLOB' and 'STMT' in the English documentation to maintain consistency with the data type mapping table and other technical references.

[Copilot]

Pull request overview

Updates the C#/.NET connector documentation to reflect support for the TDengine BLOB data type, aligning the published type-mapping tables with current connector capabilities.

Changes:

• Add BLOB -> byte[] to the C# data type mapping tables (EN/ZH).
• Document limitations for BLOB usage (not supported as tags; additional limitation note for stmt binding).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
docs/zh/14-reference/05-connector/40-csharp.mdx	Adds BLOB type mapping and a usage limitation note in the “注意” section.
docs/en/14-reference/05-connector/40-csharp.md	Adds BLOB type mapping and a usage limitation note in the “Note” section.

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