feat: migrate tests to use centralized aitbc package utilities

- Migrate HTTP client usage from requests to aitbc.AITBCHTTPClient in test files
- Update conftest.py to use aitbc path utilities (get_data_path, get_log_path)
- Update test_model_validation.py to use aitbc validators (validate_address, validate_hash)
- Skip HTML scraping files that require raw requests (verify_toggle_removed.py)
- Migrated files: test_payment_integration.py, test_cross_node_blockchain.py, verify_transactions_fixed.py, test_tx_import.py, test_simple_import.py, test_minimal.py, test_block_import_complete.py

tests/conftest.py

@@ -12,6 +12,12 @@ from unittest.mock import Mock
 project_root = Path(__file__).parent.parent
 sys.path.insert(0, str(project_root))
 
+# Add aitbc package to sys.path for centralized utilities
+sys.path.insert(0, str(project_root / "aitbc"))
+
+# Import aitbc utilities for conftest
+from aitbc import get_data_path, get_log_path
+
 # Add necessary source paths
 sys.path.insert(0, str(project_root / "packages" / "py" / "aitbc-core" / "src"))
 sys.path.insert(0, str(project_root / "packages" / "py" / "aitbc-crypto" / "src"))
@@ -44,8 +50,9 @@ sys.path.insert(0, str(project_root / "apps" / "coordinator-api"))
 
 # Set up test environment
 os.environ["TEST_MODE"] = "true"
-os.environ["AUDIT_LOG_DIR"] = str(project_root / "logs" / "audit")
+os.environ["AUDIT_LOG_DIR"] = str(get_log_path() / "audit")
 os.environ["TEST_DATABASE_URL"] = "sqlite:///:memory:"
+os.environ["DATA_DIR"] = str(get_data_path())
 
 # Mock missing optional dependencies
 sys.modules['slowapi'] = Mock()