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_genesis2.py

@@ -0,0 +1,56 @@
+with open("/home/oib/windsurf/aitbc/apps/blockchain-node/src/aitbc_chain/consensus/poa.py", "r") as f:
+    content = f.read()
+
+# Fix block creation in _propose_block where chain_id might be missing
+content = content.replace(
+    """            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,
+            )""",
+    """            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,
+            )"""
+)
+
+# Actually, the error says:
+# [SQL: INSERT INTO block (chain_id, height, hash, parent_hash, proposer, timestamp, tx_count, state_root) VALUES (?, ?, ?, ?, ?, ?, ?, ?)]
+# [parameters: (None, 1, '0x...', ...)]
+# Why is chain_id None? Let's check _propose_block
+
+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,
+            )"""
+)
+
+with open("/home/oib/windsurf/aitbc/apps/blockchain-node/src/aitbc_chain/consensus/poa.py", "w") as f:
+    f.write(content)