Role-Based Access Control for Contract Operations

[Kingsman-99]

Description

Beyond a single admin, the contract needs distinct roles — Creator, Auditor, and Operator — each with a scoped set of permitted operations. This prevents over-privileged accounts from performing actions outside their remit.

Technical Context

Add a Role enum to types.rs with variants Admin, Operator, Auditor. Store role assignments under RoleAssignment(address, role) in storage::persistent inside contracts/split/src/lib.rs. Add grant_role and revoke_role (admin-only) and a require_role helper. Gate each entry point with the appropriate role check.

Acceptance Criteria

• grant_role and revoke_role are admin-only and emit RoleGranted/RoleRevoked events
• create_invoice requires Creator or Admin role
• release_payment requires Operator or Admin role
• get_invoice is callable by any role including Auditor
• Assigning the same role twice to an address is a no-op
• All CI checks (cargo build --target wasm32-unknown-unknown, cargo test, cargo clippy) pass and the branch has no merge conflicts

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[AdEmOnD07]

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[Keengfk]

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[grantfox-oss]

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@Keengfk's PR #540 was approved and merged by @Kingsman-99.

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