fix(public): watch public create and delete event restart server

[fz6m]

修理之前群里有人反馈 public 文件夹第一次创建不生效的问题

[vercel]

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1 Ignored Deployment

Name	Status	Preview	Updated
umi	⬜️ Ignored (Inspect)		Dec 30, 2022 at 11:02AM (UTC)

[codecov]

Codecov Report

Base: 29.77% // Head: 29.71% // Decreases project coverage by -0.05% ⚠️

Coverage data is based on head (731fa1c) compared to base (467ca49).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10187      +/-   ##
==========================================
- Coverage   29.77%   29.71%   -0.06%     
==========================================
  Files         433      433              
  Lines       12455    12480      +25     
  Branches     2991     3003      +12     
==========================================
  Hits         3708     3708              
- Misses       8174     8196      +22     
- Partials      573      576       +3     

Impacted Files	Coverage Δ
packages/preset-umi/src/commands/dev/dev.ts	0.00% <0.00%> (ø)

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