remove unused queue.py module and refactor chain_id handling in CLI

Deleted aitbc/queue.py containing TaskQueue, JobScheduler, BackgroundTaskManager, and WorkerPool classes that were not being used in the codebase.

Refactored chain_id handling in CLI to use centralized get_chain_id utility function instead of duplicating chain_id detection logic in send_transaction, get_balance, and agent_operations functions.

cli/commands/blockchain.py

@@ -17,12 +17,19 @@ import os
 
 
 @click.group()
+@click.option("--chain-id", help="Chain ID for multichain operations (e.g., ait-mainnet, ait-devnet)")
 @click.pass_context
-def blockchain(ctx):
+def blockchain(ctx, chain_id: Optional[str]):
     """Query blockchain information and status"""
     # Set role for blockchain commands
     ctx.ensure_object(dict)
     ctx.parent.detected_role = 'blockchain'
+    
+    # Handle chain_id with auto-detection
+    from aitbc_cli.utils.chain_id import get_chain_id
+    config = ctx.obj.get('config')
+    default_rpc_url = _get_node_endpoint(ctx)
+    ctx.obj['chain_id'] = get_chain_id(default_rpc_url, override=chain_id)
 
 
 @blockchain.command()

cli/commands/marketplace.py

@@ -266,8 +266,10 @@ def pay(ctx, booking_id: str, amount: float, from_wallet: str, to_wallet: str, t
         address = wallet_data["address"]
         
         # Get wallet balance from blockchain
+        from aitbc_cli.utils.chain_id import get_chain_id
         rpc_url = config.get('rpc_url', 'http://localhost:8006')
-        balance_response = httpx.Client().get(f"{rpc_url}/rpc/account/{address}?chain_id=ait-testnet", timeout=5)
+        chain_id = get_chain_id(rpc_url)
+        balance_response = httpx.Client().get(f"{rpc_url}/rpc/account/{address}?chain_id={chain_id}", timeout=5)
         if balance_response.status_code != 200:
             error(f"Failed to get wallet balance")
             return
@@ -285,7 +287,7 @@ def pay(ctx, booking_id: str, amount: float, from_wallet: str, to_wallet: str, t
             "value": amount,
             "fee": 1,
             "nonce": balance_data["nonce"],
-            "chain_id": "ait-testnet",
+            "chain_id": chain_id,
             "payload": {
                 "type": "marketplace_payment",
                 "booking_id": booking_id,