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_final.py

@@ -0,0 +1,71 @@
+import asyncio
+import os
+
+# Create an alternate config just for this test process
+os.environ["SUPPORTED_CHAINS"] = "ait-devnet,ait-testnet"
+os.environ["DB_PATH"] = "./data/test_chain.db"
+os.environ["MEMPOOL_BACKEND"] = "memory"
+
+# Make sure we use a clean DB for the test
+if os.path.exists("./data/test_chain.db"):
+    os.remove("./data/test_chain.db")
+if os.path.exists("./data/test_chain.db-journal"):
+    os.remove("./data/test_chain.db-journal")
+
+async def run_test():
+    import time
+    from aitbc_chain.config import settings as test_settings
+    
+    # Start the app and the node
+    import uvicorn
+    from aitbc_chain.app import app
+    from threading import Thread
+    import requests
+
+    def run_server():
+        uvicorn.run(app, host="127.0.0.1", port=8183, log_level="error")
+
+    server_thread = Thread(target=run_server, daemon=True)
+    server_thread.start()
+    
+    time.sleep(3) # Give server time to start
+
+    try:
+        # Wait for a couple blocks to be proposed
+        time.sleep(5)
+
+        # Check block head for devnet
+        resp_dev = requests.get("http://127.0.0.1:8183/rpc/head?chain_id=ait-devnet")
+        print("Devnet head:", resp_dev.json())
+        assert "hash" in resp_dev.json() or resp_dev.json().get("detail") == "no blocks yet"
+
+        # Check block head for testnet
+        resp_test = requests.get("http://127.0.0.1:8183/rpc/head?chain_id=ait-testnet")
+        print("Testnet head:", resp_test.json())
+        assert "hash" in resp_test.json() or resp_test.json().get("detail") == "no blocks yet"
+
+        # Submit transaction to devnet
+        tx_data = {
+            "sender": "sender1",
+            "recipient": "recipient1",
+            "payload": {"amount": 10},
+            "nonce": 1,
+            "fee": 10,
+            "type": "TRANSFER",
+            "sig": "mock_sig"
+        }
+        resp_tx_dev = requests.post("http://127.0.0.1:8183/rpc/sendTx?chain_id=ait-devnet", json=tx_data)
+        print("Devnet Tx response:", resp_tx_dev.json())
+
+        print("SUCCESS! Multi-chain support is working.")
+        return True
+
+    except Exception as e:
+        print("Test failed:", e)
+        return False
+
+if __name__ == "__main__":
+    import sys
+    sys.path.append('src')
+    success = asyncio.run(run_test())
+    sys.exit(0 if success else 1)