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_poa.py

@@ -0,0 +1,83 @@
+with open("/home/oib/windsurf/aitbc/apps/blockchain-node/src/aitbc_chain/consensus/poa.py", "r") as f:
+    content = f.read()
+
+# Update _propose_block
+content = content.replace(
+    """        with self._session_factory() as session:
+            head = session.exec(select(Block).order_by(Block.height.desc()).limit(1)).first()""",
+    """        with self._session_factory() as session:
+            head = session.exec(select(Block).where(Block.chain_id == self._config.chain_id).order_by(Block.height.desc()).limit(1)).first()"""
+)
+
+content = content.replace(
+    """            block = Block(
+                height=next_height,
+                hash=block_hash,
+                parent_hash=parent_hash,
+                proposer=self._config.proposer_id,
+                timestamp=timestamp,
+                tx_count=0,
+                state_root=None,
+            )""",
+    """            block = Block(
+                chain_id=self._config.chain_id,
+                height=next_height,
+                hash=block_hash,
+                parent_hash=parent_hash,
+                proposer=self._config.proposer_id,
+                timestamp=timestamp,
+                tx_count=0,
+                state_root=None,
+            )"""
+)
+
+# Update _ensure_genesis_block
+content = content.replace(
+    """        with self._session_factory() as session:
+            head = session.exec(select(Block).order_by(Block.height.desc()).limit(1)).first()""",
+    """        with self._session_factory() as session:
+            head = session.exec(select(Block).where(Block.chain_id == self._config.chain_id).order_by(Block.height.desc()).limit(1)).first()"""
+)
+
+content = content.replace(
+    """            genesis = Block(
+                height=0,
+                hash=block_hash,
+                parent_hash="0x00",
+                proposer="genesis",
+                timestamp=timestamp,
+                tx_count=0,
+                state_root=None,
+            )""",
+    """            genesis = Block(
+                chain_id=self._config.chain_id,
+                height=0,
+                hash=block_hash,
+                parent_hash="0x00",
+                proposer="genesis",
+                timestamp=timestamp,
+                tx_count=0,
+                state_root=None,
+            )"""
+)
+
+# Update _fetch_chain_head
+content = content.replace(
+    """    def _fetch_chain_head(self) -> Optional[Block]:
+        with self._session_factory() as session:
+            return session.exec(select(Block).order_by(Block.height.desc()).limit(1)).first()""",
+    """    def _fetch_chain_head(self) -> Optional[Block]:
+        with self._session_factory() as session:
+            return session.exec(select(Block).where(Block.chain_id == self._config.chain_id).order_by(Block.height.desc()).limit(1)).first()"""
+)
+
+# Broadcast metrics specific to chain
+content = content.replace(
+    """            metrics_registry.increment("blocks_proposed_total")
+            metrics_registry.set_gauge("chain_head_height", float(next_height))""",
+    """            metrics_registry.increment(f"blocks_proposed_total_{self._config.chain_id}")
+            metrics_registry.set_gauge(f"chain_head_height_{self._config.chain_id}", float(next_height))"""
+)
+
+with open("/home/oib/windsurf/aitbc/apps/blockchain-node/src/aitbc_chain/consensus/poa.py", "w") as f:
+    f.write(content)