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_auth_error.py

@@ -0,0 +1,12 @@
+import asyncio
+from aitbc_cli.core.config import NodeConfig
+from aitbc_cli.core.node_client import NodeClient
+
+async def test():
+    config = NodeConfig(id="aitbc-primary", endpoint="http://10.1.223.93:8082")
+    async with NodeClient(config) as client:
+        print("Connected.")
+        chains = await client.get_hosted_chains()
+        print("Chains:", chains)
+
+asyncio.run(test())