添加MentionAll

[AzideCupric]

No description provided.

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[codecov]

Codecov Report

Attention: Patch coverage is 95.12195% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 95.38%. Comparing base (fa1d20b) to head (e1bec03).
Report is 2 commits behind head on main.

Files	Patch %	Lines
nonebot_plugin_saa/types/common_message_segment.py	85.71%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #161      +/-   ##
==========================================
- Coverage   95.41%   95.38%   -0.03%     
==========================================
  Files          26       26              
  Lines        2070     2144      +74     
==========================================
+ Hits         1975     2045      +70     
- Misses         95       99       +4     

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[felinae98]

要不要 fallback 成 Text("@ALL")，（意思到了就行）

[AzideCupric]

要不要 fallback 成 Text("@ALL")，（意思到了就行）

加了个fallback参数