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/blockchain-node/scripts/benchmark_throughput.py

@@ -21,10 +21,10 @@ import argparse
 import json
 from typing import List, Dict, Any
 from dataclasses import dataclass
-import logging
+from aitbc.logging import get_logger
 
 logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')
-logger = logging.getLogger(__name__)
+logger = get_logger(__name__)
 
 
 @dataclass