Add object-oriented license client library (v0.0.2)

- Add LicenseClient with PSR-3 logging and PSR-6 caching support
- Add DTO classes: LicenseInfo, LicenseStatus, ActivationResult
- Add LicenseState enum for license status values
- Add comprehensive exception hierarchy for error handling
- Add PSR dependencies (psr/log, psr/cache, psr/http-client)
- Update README with usage examples
- Update CHANGELOG for v0.0.2

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

composer.json

@@ -17,6 +17,9 @@
     },
     "require": {
         "php": "^8.3",
+        "psr/cache": "^3.0",
+        "psr/http-client": "^1.0",
+        "psr/log": "^3.0",
         "symfony/http-client": "^7.0"
     },
     "autoload": {