Ship Dynamic Functionalities 1.4.8

[wpgaurav]

Summary

• add atomic, lock-protected JSON persistence for task and redirect data
• add a lazy module registry so disabled features are not loaded
• split the admin bootstrap into focused controllers and external admin assets
• add versioned settings export/import with redaction, validation, dry-run diffs, and rollback
• add redirect CSV import/export plus a bounded, privacy-conscious 404 monitor
• add Site Health reporting, scheduled scans, finding controls, and content baseline diffs
• add PHP 7.4-8.5 CI, WordPress Coding Standards, PHPUnit coverage, package assertions, and the 1.4.8 release metadata

Validation

• composer check
• 18 PHPUnit tests, 64 assertions
• JavaScript and shell syntax checks
• clean distribution build and ZIP-content assertions
• packaged-plugin smoke test on WordPress 7.0.2 / PHP 8.3
• all-disabled runtime loads 0 feature files instead of 16 and uses about 2.22 MiB less memory than v1.4.7 in the measured Studio environment
• PWA manifest and service-worker endpoints verified after live option changes

Closes #41
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Closes #47