Test Copilot compatibility with Quarkus Spring extensions

[Dudeplayz]

Context

PR #2131 routes Copilot Spring bridge calls to Quarkus-Hilla. Compatibility with Quarkus Spring compatibility extensions is intentionally left out of scope.

Scope

• Test Copilot with quarkus-spring-di and related Spring compatibility extensions.
• Check whether Spring-annotated beans are discovered as expected.
• Verify no WebApplicationContext or Spring runtime assumptions leak back into Copilot.

Related

• Follow-up from Re-enable and test Copilot #1913.
• Split from feat(copilot): add Quarkus integration bridge #2131.