fix - move allOf before the typed shape

[mwja]

Summary

Fixes #56 by allowing AllOf to match type: object definitions (even if it is redundant, quite a few public OpenAPI specs do still provide this value), so that the following schema doesn't collapse to serde_json::Value because it match Typed and not AllOf

type: object
allOf:
  - ...
  - ...

Generated compatibility

• Generated model or method signatures: Any schema with type: object and allOf now generate the correct struct instead of becoming serde_json::Value
• Query/path/header/body wire behavior: Risks causing issues for those relying on the Value type, otherwise not much change.
• Remaining unsupported OpenAPI shapes: The same type: object but with with an array type still matches TypedMulti before AllOf so it still has the same issue. But this PR just brings AllOf to the same behaviour as AnyOf. (See review notes)

Validation

• Added or updated a focused fixture and behavioral regression test.
• Reviewed every changed snapshot; no unrelated churn is included.
• cargo fmt --check
• cargo clippy --all-features -- -D warnings
• cargo test --all-features
• Ran scripts/install-smoke.sh for packaging/dependency changes.
• Ran a targeted or full scripts/spec-compile.sh for generator changes.
• Updated README, rustdoc, or changelog for user-visible behavior.

Notes for reviewers

The issue in #56 provides a minimal reproducible example, and should be the best to check before/after. I intentionally didn't change AllOf/AnyOf to accept array type (e.g. type: [object, null] as the existing code didn't, but I'll likely make an other issue for that.

I had to change one (unrelated) test as it actually required the current behaviour instead of the 'correct' behaviour this PR introduces

[vercel]

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[lightsofapollo]

@mwja nice! Thanks for this- will release it shortly.