Standardize build metadata and code formatting

[tillig]

Summary

• Standardize .pre-commit-config.yaml, .editorconfig, build/stylecop.json, build/Source.ruleset, build/Test.ruleset to match Autofac core
• Rewrite default.proj to match standard template (was using non-standard structure)
• Apply dotnet format code formatting
• Fix SA1201 member ordering and SA1404 SuppressMessage justifications

Test plan

• CI build passes
• All tests pass
• pre-commit run --all-files passes

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 91.93%. Comparing base (b7ca1f3) to head (01a0835).

Files with missing lines	Patch %	Lines
...ofac.Extras.DynamicProxy/RegistrationExtensions.cs	88.88%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop      #59   +/-   ##
========================================
  Coverage    91.93%   91.93%           
========================================
  Files            2        2           
  Lines          124      124           
  Branches        22       22           
========================================
  Hits           114      114           
  Misses           6        6           
  Partials         4        4           

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