Feature/automated payouts

[Bakobiibizo]

Automated Payment System Implementation

Overview

This PR implements an automated payment system within the governance pallet, enabling scheduled recurring payments from the DAO treasury using block-based timing for deterministic execution.

Key Changes

1. Added new payment system in governance pallet:

   • ScheduledPayment struct for payment configuration
   • Block-based timing with next_payment_block and payment_interval
   • Configurable payment counts (finite or infinite)
   • Default 10-day payment cycle (108,000 blocks)

2. Storage and Events:

   • Added PaymentSchedules storage for active schedules
   • Added NextPaymentScheduleId counter
   • New events for payment lifecycle tracking

3. User Interface Parameters:

   • Amount: In nano'd currency (e.g., 1 token = 1,000,000,000)
   • Next Payment Block: Absolute block number for first payment
   • Payment Interval: Blocks between payments (default: 108,000)
   • Remaining Payments: Count of payments (0 for indefinite)

Testing

• Comprehensive test coverage in payments_tests.rs
• Mock runtime setup for treasury integration
• Block progression simulation
• Payment schedule validation
• Error handling scenarios

Security

• Treasury balance verification
• Governance-controlled schedule management
• Fail-safe payment processing
• Schedule cancellation support

Documentation

• Updated governance pallet documentation
• Added usage examples and parameter explanations
• Technical architecture documentation

Breaking Changes

None. This is a new feature addition that maintains compatibility with existing functionality.

Checklist

• Implemented core payment scheduling logic
• Added comprehensive tests
• Updated documentation
• Removed experimental pallet
• Fixed all clippy warnings
• Verified treasury integration