Add PHP 8.3 typed constants and #[Override] attributes

[bbankowski]

Summary

• Add typed class constants (PHP 8.3) to all 133 untyped constants across Core, Goodies, Inject, and Migrations
• Add #[Override] attribute (PHP 8.3) to all 242 overriding methods across the codebase

Details

Typed class constants

Every class constant now declares its type explicitly (string, int, bool), making the intent clear and enabling stricter static analysis.

#[Override] attribute

Every method that overrides a parent class method or implements an interface method is annotated with #[Override]. This causes PHP to emit a compile-time error if the method no longer overrides anything (e.g. after a parent rename), preventing silent bugs.

Test plan

• PHP syntax check passed on all modified files
• Goodies test suite: 892 tests, 0 failures (26 DB-related errors expected without a database container)
• Inject test suite: 41 tests, 103 assertions, all green

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