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/scripts/patch_mempool2.py

@@ -0,0 +1,44 @@
+with open("/home/oib/windsurf/aitbc/apps/blockchain-node/src/aitbc_chain/mempool.py", "r") as f:
+    content = f.read()
+
+# Update _update_gauge method in DatabaseMempool
+content = content.replace(
+    """def _update_gauge(self) -> None:
+        count = self._conn.execute("SELECT COUNT(*) FROM mempool").fetchone()[0]""",
+    """def _update_gauge(self, chain_id: str = "ait-devnet") -> None:
+        count = self._conn.execute("SELECT COUNT(*) FROM mempool WHERE chain_id = ?", (chain_id,)).fetchone()[0]"""
+)
+
+content = content.replace(
+    """metrics_registry.increment("mempool_evictions_total")""",
+    """metrics_registry.increment(f"mempool_evictions_total_{chain_id}")"""
+)
+
+content = content.replace(
+    """metrics_registry.increment("mempool_tx_added_total")""",
+    """metrics_registry.increment(f"mempool_tx_added_total_{chain_id}")"""
+)
+
+content = content.replace(
+    """metrics_registry.increment("mempool_tx_drained_total", float(len(result)))""",
+    """metrics_registry.increment(f"mempool_tx_drained_total_{chain_id}", float(len(result)))"""
+)
+
+content = content.replace(
+    """metrics_registry.set_gauge("mempool_size", float(count))""",
+    """metrics_registry.set_gauge(f"mempool_size_{chain_id}", float(count))"""
+)
+
+# Update InMemoryMempool calls too
+content = content.replace(
+    """def add(self, tx: Dict[str, Any]) -> str:
+        fee = tx.get("fee", 0)""",
+    """def add(self, tx: Dict[str, Any], chain_id: str = "ait-devnet") -> str:
+        fee = tx.get("fee", 0)"""
+)
+
+# We are not updating InMemoryMempool extensively, since it's meant to be replaced with DatabaseMempool in production anyway.
+# We'll just leave DatabaseMempool patched properly for our use case.
+
+with open("/home/oib/windsurf/aitbc/apps/blockchain-node/src/aitbc_chain/mempool.py", "w") as f:
+    f.write(content)