Scope all PSR libraries and remove PSR Log compatibility layers

[jakejackson1]

Summary

Prefixes every PSR library under GFPDF_Vendor via php-scoper so the plugin is fully self-contained and can no longer collide with other plugins that ship psr/log v2 or v3. This lets us delete the runtime PSR Log 1/2/3 compatibility layer entirely.

Changes

• php-scoper config
  • Dropped the 'Psr\*' whitelist from tools/php-scoper/config/monolog.php so Monolog's PSR references get prefixed to GFPDF_Vendor\Psr\*.
  • Removed the tools/php-scoper/config/mpdf.php patcher that stripped the prefix back off LoggerInterface in the mPDF logger-aware traits.
• Removed the PSR Log 1/2/3 compatibility layer
  • Deleted src/Helper/Log/MonoLoggerPsrLog2And3.php (the v2/v3 proxy).
  • Stripped Logger::get_monolog()'s runtime version probe and class_alias bridging; setup_logger() now instantiates Monolog directly.
  • Deleted the obsolete Test_MonoLoggerPsrLog2And3.php and updated Test_Logger.php.
• Type hints — all 28 use Psr\Log\LoggerInterface; statements in src/ now use use GFPDF_Vendor\Psr\Log\LoggerInterface;.

Verification

• Regenerated vendor_prefixed/ via composer install + composer prefix; confirmed Monolog and the mPDF traits consistently reference GFPDF_Vendor\Psr\Log\* and the autoloader maps the prefixed classes.
• Full PHP suite green: 1513 tests, 4862 assertions, 17 pre-existing skips. The PDF-generation path (mPDF setLogger ← the prefixed logger) passes.
• PHPCS clean on the changed source.

Dependent add-on PRs

Removing the unprefixed \Psr\Log shim means add-ons that type-hinted the logger against the plain interface now receive a scoped logger that no longer satisfies that hint. These companion PRs decouple each add-on's logger boundary so they work against both this (scoped) core and older (unprefixed) releases. They should land alongside this PR:

• GravityPDF/gravity-pdf-bulk-generator#201 — untype $log in SessionId / ZipPath
• GravityPDF/pdf-for-gravityview#88 — untype $log in PdfEmail
• GravityPDF/gravity-pdf-images#2 — untype $log in DoesTemplateHaveGroup + test logger
• GravityPDF/gravity-pdf-for-wpml#16 — test logger via GPDFAPI::get_log_class()
• GravityPDF/gravity-pdf-core-booster#125 — remove dead Monolog\Logger imports

An org-wide audit of the remaining ~30 dependent repos found no other add-on type-hinting the logger boundary (most consume it only via Helper_Trait_Logger + duck-typed calls, which is unaffected).

Notes

psr/container is only a dev-time transitive dependency of php-scoper's own Symfony components and isn't referenced by any production package, so it's intentionally left out of scoping (it won't ship in the --no-dev release build).

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