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

dev/tests/test_multi_chain_check.py

@@ -0,0 +1,9 @@
+import os
+import requests
+import time
+
+try:
+    resp = requests.get("http://127.0.0.1:8182/rpc/head?chain_id=ait-devnet")
+    print("Devnet head:", resp.json())
+except Exception as e:
+    print("Error:", e)