refactor: migrate all remaining modules to use shared aitbc.logging from aitbc-core package

- Replace `import logging` with `from aitbc.logging import get_logger` across blockchain-node scripts and coordinator-api modules
- Update logger initialization from `logging.getLogger(__name__)` to `get_logger(__name__)` in 30+ files
- Add production configuration validators for API keys, HMAC secret, and JWT secret in coordinator config
- Enhance coordinator startup with comprehensive initialization logging

apps/coordinator-api/migrations/003_data_migration.py

@@ -13,7 +13,7 @@ Usage:
 import argparse
 import asyncio
 import json
-import logging
+from aitbc.logging import get_logger
 from datetime import datetime
 from pathlib import Path
 from typing import List, Dict, Any
@@ -21,7 +21,7 @@ from typing import List, Dict, Any
 import asyncpg
 
 logging.basicConfig(level=logging.INFO)
-logger = logging.getLogger(__name__)
+logger = get_logger(__name__)
 
 
 class DataMigration: