fix: preserve GraphQL resolvers/metadata

[DamianCzajkowski]

Summary

• Preserve is_type_of/resolve_type and related GraphQL metadata (description, extensions, AST nodes) when copying and merging object/interface/union types.
• Make query splitting keep GraphQL meta/introspection fields (__typename, __schema, __type) and preserve directive variables/arguments.
• Add focused tests for copy/merge behavior and proxy query forwarding to prevent regressions.

[coderabbitai]

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