[WIP] WIP Address feedback on gateway batcher design for production readiness

[Copilot]

• Find all occurrences of 'regsitry' typo in the codebase
• Fix typo in services/gateway/src/types.rs (struct field definition)
• Fix typo in services/gateway/src/routes.rs (struct initialization)
• Fix typo in services/gateway/src/routes/middleware.rs (field access)
• Fix typo in services/gateway/src/routes/is_valid_root.rs (field access - 2 occurrences)
• Verify code compiles successfully
• Run tests to verify changes don't break functionality
• Run final code review

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Note

Fixes misspelled state.regsitry references in services/gateway/src/routes/is_valid_root.rs.

• Corrects field access to state.registry when calling isValidRoot and when passing the contract to cache_policy_for_root
• Ensures both the validity check and cache policy use the correct registry instance

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