[8.0] Symfony 8 / PHP 8.5 modernisation

[wtorsi]

Summary

• Major refactor: PSR-4 src/ layout, S3 loader/resolver support, async Messenger processing, client SDK, security hardening
• Quality & DX: ImageFormat/ImagineDriver enums, #[Override] attributes, driver short aliases (gd/imagick/gmagick), configurable binary paths
• Security: SSRF protection on StreamLoader (URI scheme allowlist), DoS pixel budget on output dimensions, S3 dangerous extension blocking, Cache-Control/ACL on S3 uploads
• Cache optimisation: resolveIfStored() single-pass existence check + URL resolution on all resolvers
• Bug fixes: 14 PHPStan fixes, DI wiring fixes, density propagation, binary MIME fallback, absolute path handling
• Twig: restored image_filter filter, added filter parameter to fit/fill/optimize, removed unused avif filter
• Tests: comprehensive unit + integration test coverage for controllers, cache, security, concurrency, bundle boot, filter manager, processors, post-processors
• Docs: README updated to reflect all changes — new config options, SSRF docs, S3 options, enum references

Test plan

• composer test passes all unit and integration tests
• composer cs-check reports no style violations
• PHPStan analysis passes at max level
• Verify Twig filters (image_filter, fit, fill, optimize) work in a Symfony 8 app
• Verify S3 resolver uploads include Cache-Control header
• Verify StreamLoader rejects disallowed URI schemes

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