refactor(domain): standardize metadata field naming to meta_data across all models

- Rename metadata fields to meta_data for consistency across domain models
- Update agent_identity, agent_performance, agent_portfolio, amm, analytics, bounty, certification, community, cross_chain_bridge, cross_chain_reputation, decentralized_memory, miner, pricing_models, trading, and wallet models
- Rename chain_metadata to chain_meta_data in CrossChainMapping
- Rename verification_metadata to verification_meta_data

apps/coordinator-api/aitbc/logging.py

@@ -0,0 +1,31 @@
+"""
+Logging utilities for AITBC coordinator API
+"""
+
+import logging
+import sys
+from typing import Optional
+
+def setup_logger(
+    name: str,
+    level: str = "INFO",
+    format_string: Optional[str] = None
+) -> logging.Logger:
+    """Setup a logger with consistent formatting"""
+    if format_string is None:
+        format_string = "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
+    
+    logger = logging.getLogger(name)
+    logger.setLevel(getattr(logging, level.upper()))
+    
+    if not logger.handlers:
+        handler = logging.StreamHandler(sys.stdout)
+        formatter = logging.Formatter(format_string)
+        handler.setFormatter(formatter)
+        logger.addHandler(handler)
+    
+    return logger
+
+def get_logger(name: str) -> logging.Logger:
+    """Get a logger instance"""
+    return logging.getLogger(name)