chore: Refactor order of config resolution

[aklinker1]

See #577 (comment). Now config is always resolved immediately at the beginning of all public APIs.

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[codecov]

Codecov Report

Attention: Patch coverage is 88.63636% with 15 lines in your changes are missing coverage. Please review.

Project coverage is 86.21%. Comparing base (448436c) to head (c07e996).
Report is 2 commits behind head on main.

Files	Patch %	Lines
src/core/create-server.ts	79.31%	12 Missing ⚠️
src/core/utils/building/resolve-config.ts	88.88%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #578      +/-   ##
==========================================
- Coverage   86.36%   86.21%   -0.15%     
==========================================
  Files         111      111              
  Lines        8888     8909      +21     
  Branches      879      887       +8     
==========================================
+ Hits         7676     7681       +5     
- Misses       1198     1214      +16     
  Partials       14       14              

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