feat: add service operation metadata catalog

[LioRael]

Summary

• Add service operation metadata to the Rust contract surface for HTTP routes, runtime functions, actions, and events.
• Expose provider module operation inventories through the Host admin data API.
• Document the V8 service operations plane and service log evidence path.

Validation

• cargo test --locked -p lenso-contracts operation_metadata_serializes_on_route_runtime_and_action
• cargo test --locked -p lenso-api service_modules_exposes_operations_for_provider_modules
• just generated-check

Cross-repo notes

• Pairs with lenso-cli, lenso-runtime-console, lenso-examples, and lenso-auth-module V8 PRs.

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