Re-enable state root computation in blockchain node

- Fix chain_id mismatch (ait-devnet -> ait-mainnet)
- Add logger definition to poa.py for state root computation
- Recompute state_root after genesis account initialization
- Create genesis.json with account allocations for ait-mainnet
- Update config.py supported_chains to ait-mainnet

tests/verification/test_tx_import.py

@@ -8,7 +8,7 @@ import hashlib
 import requests
 
 BASE_URL = "https://aitbc.bubuit.net/rpc"
-CHAIN_ID = "ait-devnet"
+CHAIN_ID = "ait-mainnet"
 
 def compute_block_hash(height, parent_hash, timestamp):
     """Compute block hash using the same algorithm as PoA proposer"""
@@ -52,7 +52,7 @@ def test_transaction_import():
     
     # Import the block
     response = requests.post(
-        f"{BASE_URL}/blocks/import",
+        f"{BASE_URL}/importBlock",
         json=test_block
     )