Modernize library to PHP 8.4

[jdrieghe]

What changed

Added

• PHP CS Fixer for code style enforcement (.php-cs-fixer.dist.php)
• CI job for code style checks

Changed

• Minimum PHP version raised to 8.4
• Namespace changed from Madewithlove\ to Madewithlove\HtaccessApiClient\
• HtaccessResult, ResultLine, and ShareResult are now readonly classes
• ServerVariables and HtaccessException are now final
• API requests now include an Accept: application/json header, fixing error responses that previously returned a redirect
• Error response handling updated to match the current API format
• PHPUnit upgraded from 9 to 13, PHPStan from 1 to 2, Infection from 0.26 to 0.32
• Replaced deprecated Guzzle adapter packages with native Guzzle 7 PSR-18 support
• CI updated to use modern GitHub Actions versions and a dedicated code style job

Removed

• ServerVariable class — it was already deprecated; use plain strings instead

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (5719411) to head (0fa4f10).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##                main       #41   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity        27        30    +3     
===========================================
  Files              6         6           
  Lines            108       113    +5     
===========================================
+ Hits             108       113    +5     

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[WouterSioen]

Nice!