Switch license to Apache 2.0

[AdrianAtZyte]

Switches the project's license to Apache License 2.0.

• Replaces the LICENSE file with the standard Apache License 2.0 text.
• Updates the license metadata (and license classifier / references where present) accordingly.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (cadac8a) to head (61bcd3c).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #15   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines          135       135           
  Branches        26        26           
=========================================
  Hits           135       135           

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