```

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/developer/api/coordinator/authentication.md

@@ -0,0 +1,111 @@
+---
+title: API Authentication
+description: Understanding authentication for the Coordinator API
+---
+
+# API Authentication
+
+All Coordinator API endpoints require authentication using API keys.
+
+## Getting Started
+
+1. Sign up at [AITBC Dashboard](https://dashboard.aitbc.io)
+2. Generate an API key
+3. Include the key in your requests
+
+## Authentication Methods
+
+### HTTP Header (Recommended)
+```http
+X-API-Key: your_api_key_here
+```
+
+### Query Parameter
+```http
+GET /v1/jobs?api_key=your_api_key_here
+```
+
+## Example Requests
+
+### cURL
+```bash
+curl -X GET https://aitbc.bubuit.net/api/v1/jobs \
+  -H "X-API-Key: your_api_key_here"
+```
+
+### Python
+```python
+import requests
+
+headers = {
+    "X-API-Key": "your_api_key_here"
+}
+
+response = requests.get(
+    "https://aitbc.bubuit.net/api/v1/jobs",
+    headers=headers
+)
+```
+
+### JavaScript
+```javascript
+const headers = {
+    "X-API-Key": "your_api_key_here"
+};
+
+fetch("https://aitbc.bubuit.net/api/v1/jobs", {
+    headers: headers
+})
+.then(response => response.json())
+.then(data => console.log(data));
+```
+
+## Security Best Practices
+
+- Never expose API keys in client-side code
+- Use environment variables in production
+- Rotate keys regularly
+- Monitor API usage
+- Use HTTPS for all requests
+
+## Rate Limits
+
+API requests are rate-limited based on your plan:
+- Free: 60 requests/minute
+- Pro: 600 requests/minute
+- Enterprise: 6000 requests/minute
+
+Rate limit headers are included in responses:
+```http
+X-RateLimit-Limit: 60
+X-RateLimit-Remaining: 59
+X-RateLimit-Reset: 1640995200
+```
+
+## Error Handling
+
+```json
+{
+  "error": {
+    "code": "INVALID_API_KEY",
+    "message": "The provided API key is invalid"
+  }
+}
+```
+
+## Key Management
+
+### View Your Keys
+Visit the [Dashboard](https://dashboard.aitbc.io/api-keys)
+
+### Revoke a Key
+```bash
+curl -X DELETE https://aitbc.bubuit.net/api/v1/api-keys/{key_id} \
+  -H "X-API-Key: your_master_key"
+```
+
+### Regenerate a Key
+```bash
+curl -X POST https://aitbc.bubuit.net/api/v1/api-keys/{key_id}/regenerate \
+  -H "X-API-Key: your_master_key"
+```