建议增加标签管理

[Tomp-Akoe]

目前的标签比较混乱，多级标签下全部都堆在了一块，比较难找。但是memos的官方是可以标签分级。

[Issues-translate-bot]

Issue is not in English. It has been translated automatically.

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Title: It is recommended to add tag management

The current tags are quite confusing. They are all piled together under multi-level tags, making it difficult to find. But memos can officially label and classify.

[mudkipme]

Multi-level tags is now supported.