chore: remove obsolete backup directories from March 2026

- Deleted backup_20260329_183359 (block height 2222, 3 accounts, 4 transactions)
- Deleted dependency_backup_20260331_204119 (pyproject.toml, requirements files)
- Deleted pre_deployment_20260402_120429 (config examples and environment templates)

backups/pre_deployment_20260402_120429/config/python/pytest.ini

@@ -1,26 +0,0 @@
-[tool:pytest]
-# Fixed: Comprehensive test discovery
-testpaths = tests
-           apps/agent-protocols/tests
-           apps/ai-engine/tests
-           apps/analytics-platform/tests
-           apps/blockchain-node/tests
-           apps/coordinator-api/tests
-           apps/pool-hub/tests
-           apps/predictive-intelligence/tests
-           apps/wallet/tests
-           apps/explorer-web/tests
-           apps/wallet-daemon/tests
-           apps/zk-circuits/test
-           cli/tests
-           contracts/test
-           packages/py/aitbc-crypto/tests
-           packages/py/aitbc-sdk/tests
-           packages/solidity/aitbc-token/test
-           scripts/test
-
-# Additional options
-python_files = test_*.py *_test.py
-python_classes = Test*
-python_functions = test_*
-addopts = --verbose --tb=short