feat: add content management system smart contract

[dinahmaccodes]

PR Description

• 20 comprehensive tests covering:
  • Initialization and admin setup
  • Instructor management (add/remove)
  • Content CRUD operations
  • Access control scenarios (public, enrolled, restricted)
  • Enrollment management
  • Content versioning
  • Publication lifecycle
  • Error cases and boundary conditions

All tests passing ✓

📋 Acceptance Criteria

• Core logic for Content Management System implemented
• Compatible with existing User Dashboard infrastructure
• Comprehensive test coverage (20 tests)
• Code follows Soroban best practices
• Storage efficiency (off-chain content, on-chain hashes)
• TTL management for persistent data
• Documentation updated (README included)
• Event emission for monitoring
• Authentication and authorization implemented
• Immutable records (archival only, no deletion)

🔧 Technical Details

Tech Stack: Rust, Soroban SDK 22.0.0
Contract Size: Optimized WASM build
Storage Pattern: Instance (config) + Persistent (data)
Protocol Version: 22

📝 Files Changed

• contracts/content_management_system/src/lib.rs - Main contract logic
• contracts/content_management_system/src/types.rs - Data structures
• contracts/content_management_system/src/storage.rs - Storage layer
• contracts/content_management_system/src/events.rs - Event emissions
• contracts/content_management_system/src/errors.rs - Error types
• contracts/content_management_system/src/test.rs - Test suite
• contracts/content_management_system/Cargo.toml - Package config
• contracts/content_management_system/README.md - Documentation
• contracts/Cargo.toml - Workspace updated
• .kiro/specs/content-management-system/ - Requirements specification

🔗 Integration

This contract provides the backend for:

• User Dashboard content management
• IPFS/decentralized storage integration
• Frontend integration via Stellar SDK

Acceptance Criteria Met

Issue #789 - Content Management System

Core logic for Content Management System implemented
Compatible with existing User Dashboard infrastructure
Comprehensive test coverage (20 tests)
Code follows project style guidelines
Documentation updated

Issue #793 - Testnet Faucet Integration

Core logic for Testnet Faucet Integration implemented
Compatible with Hackathon Project Idea Generator
Comprehensive test coverage (9 tests)
Code follows project style guidelines
Documentation updated

Issue #790 - Automated Testing Suite

Core logic for Automated Testing Suite implemented
Compatible with Web3 Learning Roadmap infrastructure
Comprehensive test coverage (9 tests)
Code follows project style guidelines
Documentation updated

Issue #791 - CI/CD Pipeline
Core logic for CI/CD Pipeline implemented
Compatible with Open Source Contribution Trainer
Comprehensive test coverage (10 tests)
Code follows project style guidelines
Documentation updated

All contracts build successfully:

✅ content-management-system
✅ testnet-faucet-integration
✅ automated-testing-suite
✅ cicd-pipeline

All tests pass:

✅ 48/48 tests passing (100%)
Closes #789
Closes #790
Closes #791
Closes #793

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[dinahmaccodes]

@ayomideadeniran please review

[ayomideadeniran]

Pr under review

[dinahmaccodes]

okay sir @ayomideadeniran