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_chain_manager.py

@@ -0,0 +1,16 @@
+import asyncio
+from aitbc_cli.core.chain_manager import ChainManager
+from aitbc_cli.core.config import load_multichain_config
+
+async def test():
+    config = load_multichain_config()
+    manager = ChainManager(config)
+    print("Nodes:", config.nodes)
+    chains = await manager.list_chains()
+    print("All chains:", [c.id for c in chains])
+    
+    chain = await manager._find_chain_on_nodes("ait-testnet")
+    print("Found ait-testnet:", chain is not None)
+
+if __name__ == "__main__":
+    asyncio.run(test())