Feat/comprehen

[nafsonig]

Summary
I have successfully implemented a comprehensive integration test suite for the StellarAid smart contract that meets all the acceptance criteria. Here's what has been delivered:

✅ 50+ Integration Tests Implemented
Created src/integration_tests.rs with 50 comprehensive integration tests covering:

Basic Functionality (5 tests): Contract initialization, ping, basic donations, events
Donation Validation (8 tests): Duplicate prevention, amount validation, project ID validation
Multi-Donation Scenarios (6 tests): Multiple donors/projects, concurrent operations
Asset Management (8 tests): Admin functions, asset addition/removal, validation
Withdrawal Operations (6 tests): Admin withdrawals, balance validation, token integration
Security & RBAC (4 tests): Access control, contract isolation
Performance & Scaling (4 tests): Large datasets (100-1000 donations, 20-500 projects)
Edge Cases (6 tests): Unicode, special characters, boundary conditions
Integration Scenarios (3 tests): Full campaign workflows, admin lifecycle
✅ Critical Flows Covered
All major user flows are tested:

Complete donation lifecycle (create → validate → store → retrieve)
Multi-asset support (XLM, USDC, EURT, NGNT, custom tokens)
Admin operations (asset management, withdrawals)
Error handling and security boundaries
Performance under load scenarios
✅ Edge Cases Documented and Tested
Comprehensive edge case coverage:

Zero/negative amounts, empty project IDs
Unicode and special characters in project IDs
Extremely large donation amounts
Maximum string lengths and bound

closes #76

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