chore: remove configuration files and enhance blockchain explorer with advanced search, analytics, and export features

- Delete .aitbc.yaml.example CLI configuration template
- Delete .lycheeignore link checker exclusion rules
- Delete .nvmrc Node.js version specification
- Add advanced search panel with filters for address, amount range, transaction type, time range, and validator
- Add analytics dashboard with transaction volume, active addresses, and block time metrics
- Add Chart.js integration

apps/blockchain-node/src/aitbc_chain/logger.py

@@ -0,0 +1,43 @@
+import logging
+import sys
+from logging.handlers import RotatingFileHandler
+import json
+from datetime import datetime
+
+class JsonFormatter(logging.Formatter):
+    def format(self, record):
+        log_record = {
+            "timestamp": datetime.utcnow().isoformat() + "Z",
+            "level": record.levelname,
+            "logger": record.name,
+            "message": record.getMessage()
+        }
+        
+        # Add any extra arguments passed to the logger
+        if hasattr(record, "chain_id"):
+            log_record["chain_id"] = record.chain_id
+        if hasattr(record, "supported_chains"):
+            log_record["supported_chains"] = record.supported_chains
+        if hasattr(record, "height"):
+            log_record["height"] = record.height
+        if hasattr(record, "hash"):
+            log_record["hash"] = record.hash
+        if hasattr(record, "proposer"):
+            log_record["proposer"] = record.proposer
+        if hasattr(record, "error"):
+            log_record["error"] = record.error
+            
+        return json.dumps(log_record)
+
+def get_logger(name: str) -> logging.Logger:
+    logger = logging.getLogger(name)
+    
+    if not logger.handlers:
+        logger.setLevel(logging.INFO)
+        
+        # Console handler
+        console_handler = logging.StreamHandler(sys.stdout)
+        console_handler.setFormatter(JsonFormatter())
+        logger.addHandler(console_handler)
+        
+    return logger