```

chore: refactor logging module, update genesis timestamp, remove model relationships, and reorganize routers

- Rename logging.py to logger.py and update import paths in poa.py and main.py
- Update devnet genesis timestamp to 1766828620
- Remove SQLModel Relationship declarations from Block, Transaction, and Receipt models
- Add SessionDep type alias and get_session dependency in coordinator-api deps
- Reorganize coordinator-api routers: replace explorer/registry with exchange, users, marketplace

docs/tutorials/index.md

@@ -0,0 +1,45 @@
+# AITBC Tutorials
+
+Welcome to the AITBC tutorials section. Here you'll find comprehensive guides for building on the AITBC platform.
+
+## Core Platform Tutorials
+
+### [Building Custom Proposers](custom-proposer.md)
+Learn how to create custom block proposers for specialized consensus logic in AITBC's Proof of Authority system.
+
+### [Marketplace Extensions](marketplace-extensions.md)
+Discover how to extend the AITBC marketplace with custom auction types, service categories, and integrations.
+
+## Infrastructure Tutorials
+
+### [Mining Setup](mining-setup.md)
+Set up your GPU miners to participate in the AITBC network and earn rewards.
+
+### [Running a Node](running-node.md)
+Deploy and operate your own AITBC blockchain node.
+
+## Development Tutorials
+
+### [Building a DApp](building-dapp.md)
+Create decentralized applications on top of the AITBC platform.
+
+### [Integration Examples](integration-examples.md)
+Real-world examples of integrating AITBC services into your applications.
+
+## Advanced Tutorials
+
+### [Zero-Knowledge Applications](../zk-applications.md)
+Implement privacy-preserving features using ZK-SNARKs.
+
+### [Cross-Chain Integration](../developer/cross-chain.md)
+Connect AITBC with other blockchain networks.
+
+## Contributing
+
+Have a tutorial idea? We'd love your contributions! Check out our [contributing guide](../developer/contributing.md) to get started.
+
+## Need Help?
+
+- Join our [Discord community](https://discord.gg/aitbc)
+- Browse our [FAQ](../resources/faq.md)
+- Contact [support](../resources/support.md)