chore: upgrade php8.5 and laravel13

[iqrammm97]

Summary

Rebuilds the settings package as a typed Laravel 13 implementation. Settings
remain a JSON document associated with an Eloquent model, with safer creation,
request-local memoization, automatic cache invalidation, custom setting-model
support, and after-commit broadcasts.

What changed

• Require PHP 8.5 and Laravel 13 database, cache, broadcasting, queue, and
  support components.
• Replace cache tags with Laravel's Cache::memo() repository, allowing the
  package to work with cache stores that do not support tags.
• Add a #[ObservedBy] observer that invalidates cached settings after every
  save or delete, including writes performed outside setSetting().
• Create settings through firstOrCreate() and protect each morph owner with a
  unique (model_type, model_id) database constraint.
• Support dot-notation writes and recursively merge multi-setting payloads
  without discarding unrelated nested values.
• Add late-static return types so configured custom Setting subclasses are
  created and returned correctly.
• Reject unsaved owner models, invalid configured model classes, and corrupted
  cache values with explicit exceptions.
• Restore normal Eloquent toArray() serialization while keeping broadcast
  payloads limited to setting values.
• Dispatch SettingSaved broadcasts only after the surrounding database
  transaction commits.
• Replace the timestamped legacy migration stub with an anonymous publishable
  Laravel migration.
• Move test factories out of production autoloading and expand coverage for
  defaults, nested writes, cache invalidation, custom models, invalid states,
  deletion, and broadcasting.
• Add Pint, Larastan/PHPStan at maximum level, PHPUnit 12, Testbench 11,
  Composer validation, security auditing, and an 85% CI coverage gate.
• Update NPMS to consume the new contract and automatic invalidation behavior.