refactor: consolidate logging to shared aitbc-core package and upgrade database dependencies

- Upgrade SQLAlchemy to 2.0.47 with asyncio extras in blockchain-node and coordinator-api
- Add asyncpg >=0.29.0 for PostgreSQL async support
- Remove uvloop as optional dependency, make it required >=0.22.0
- Delete duplicate logger.py from blockchain-node (117 lines)
- Refactor coordinator-api logging to use shared aitbc.logging from aitbc-core package
- Add aitbc-core package dependency to coordinator

apps/coordinator-api/src/app/logging.py

@@ -1,101 +1,3 @@
-"""
-Logging configuration for the AITBC Coordinator API
+from aitbc.logging import get_logger, setup_logger
 
-Provides structured JSON logging for better observability and log parsing.
-"""
-
-import logging
-import sys
-import json
-from datetime import datetime
-from typing import Any, Dict, Optional
-from pythonjsonlogger import jsonlogger
-
-
-class StructuredLogFormatter(jsonlogger.JsonFormatter):
-    """Custom JSON formatter for structured logging."""
-    
-    def add_fields(self, log_record: Dict[str, Any], record: logging.LogRecord, message_dict: Dict[str, Any]) -> None:
-        super().add_fields(log_record, record, message_dict)
-        log_record['timestamp'] = datetime.utcnow().isoformat() + 'Z'
-        log_record['service'] = 'aitbc-coordinator-api'
-        log_record['level'] = record.levelname
-        log_record['logger'] = record.name
-        log_record['module'] = record.module
-        log_record['function'] = record.funcName
-        log_record['line'] = record.lineno
-        
-        if record.exc_info:
-            log_record['exception'] = self.format_exception(record.exc_info)
-    
-    @staticmethod
-    def format_exception(exc_info) -> Optional[Dict[str, Any]]:
-        """Format exception info for JSON output."""
-        if exc_info is None:
-            return None
-        import traceback
-        return {
-            'type': exc_info[0].__name__ if exc_info[0] else None,
-            'message': str(exc_info[1]) if exc_info[1] else None,
-            'traceback': traceback.format_exception(*exc_info) if exc_info[0] else None
-        }
-
-
-class AuditLogger:
-    """Audit logger for tracking sensitive operations."""
-    
-    def __init__(self, logger: logging.Logger):
-        self.logger = logger
-    
-    def log(self, action: str, user_id: Optional[str] = None, resource_id: Optional[str] = None, 
-            details: Optional[Dict[str, Any]] = None, success: bool = True) -> None:
-        """Log an audit event."""
-        self.logger.info(
-            "audit_event",
-            extra={
-                'audit': {
-                    'action': action,
-                    'user_id': user_id,
-                    'resource_id': resource_id,
-                    'details': details or {},
-                    'success': success
-                }
-            }
-        )
-
-
-def setup_logging(level: str = "INFO", json_format: bool = True) -> None:
-    """Setup structured logging for the application."""
-    root_logger = logging.getLogger()
-    root_logger.handlers.clear()
-    
-    if json_format:
-        handler = logging.StreamHandler(sys.stdout)
-        handler.setFormatter(StructuredLogFormatter(
-            '%(timestamp)s %(level)s %(message)s'
-        ))
-    else:
-        handler = logging.StreamHandler(sys.stdout)
-        handler.setFormatter(
-            logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
-        )
-    
-    root_logger.addHandler(handler)
-    root_logger.setLevel(getattr(logging, level.upper()))
-    
-    logging.getLogger('uvicorn').setLevel(level)
-    logging.getLogger('uvicorn.access').setLevel(level)
-
-
-def get_logger(name: str) -> logging.Logger:
-    """Get a logger instance."""
-    return logging.getLogger(name)
-
-
-def get_audit_logger(name: str = "audit") -> AuditLogger:
-    """Get an audit logger instance."""
-    return AuditLogger(get_logger(name))
-
-
-# Initialize default logging on import
-setup_logging()
+__all__ = ["get_logger", "setup_logger"]