feat: gate revenue_deposit_contract.deposit on offering allowlist

[Danielodingz]

Close #481

Summary

• add an admin-managed allowlist for authorized offering contract addresses
• gate revenue deposits so only approved callers can fund periods
• reject unauthorized callers with UnauthorizedDepositor
• emit dep_allow_add and dep_allow_rm events for allowlist changes
• add regression tests covering unauthorized, authorized, and empty-allowlist cases
• document the new deposit guard in the revenue deposit contract docs

Testing

• attempted targeted Rust test execution for the new regression cases
• local verification is currently blocked by existing repository-wide compile issues in the main contract module, so full cargo test validation could not be completed in this environment

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[Danielodingz]

Hello @thlpkee20-wq please review PR and merge