BISON_OUTER_URL配置改进

[SherkeyXD]

close #308

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (05d01ae) 82.51% compared to head (e7ea91c) 82.53%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #405      +/-   ##
==========================================
+ Coverage   82.51%   82.53%   +0.01%     
==========================================
  Files          64       64              
  Lines        3243     3246       +3     
==========================================
+ Hits         2676     2679       +3     
  Misses        567      567              

Flag	Coverage Δ
smoke-test	82.53% <100.00%> (+0.01%)	⬆️

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Files	Coverage Δ
nonebot_bison/admin_page/__init__.py	75.75% <100.00%> (ø)
nonebot_bison/plugin_config.py	100.00% <100.00%> (ø)

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