build: upgrade to Laravel 13

[vcnainala]

Summary

• Upgrade Laravel from 12.x to 13.18 with compatible package bumps (l5-swagger 11, spatie/backup 10, markable 3, tinker 3, boost 2, PHPUnit 12)
• Apply Laravel 13 configuration changes for Sanctum CSRF middleware, cache serializable_classes, and PHPUnit 12
• Configure l5-swagger 11 to scan legacy OpenAPI docblock annotations and regenerate API docs

Test plan

• vendor/bin/pint --dirty
• php artisan l5-swagger:generate
• php artisan test --no-coverage (2296 passed locally)
• CI green on PHP 8.4
• Pin SESSION_COOKIE, REDIS_PREFIX, and CACHE_PREFIX in production .env before deploy
• Staging smoke test: login/session, /api/documentation, php artisan backup:run --only-db

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.55%. Comparing base (2a8b239) to head (a64104d).

Additional details and impacted files

@@                Coverage Diff                @@
##             development    #1441      +/-   ##
=================================================
- Coverage          76.55%   76.55%   -0.01%     
  Complexity          3575     3575              
=================================================
  Files                247      247              
  Lines              13450    13450              
=================================================
- Hits               10297    10296       -1     
- Misses              3153     3154       +1     

Flag	Coverage Δ
unittests	76.55% <ø> (-0.01%)	⬇️

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