fix: web config file not loaded when is relative path

[monkeyWie]

related: #605

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 15 lines in your changes missing coverage. Please review.

Project coverage is 60.95%. Comparing base (7ca1cc8) to head (3bb3496).

Files	Patch %	Lines
cmd/server.go	0.00%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #636      +/-   ##
==========================================
- Coverage   62.25%   60.95%   -1.30%     
==========================================
  Files          35       35              
  Lines        3518     3537      +19     
==========================================
- Hits         2190     2156      -34     
- Misses       1053     1114      +61     
+ Partials      275      267       -8     

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