feat: migrate coordinator-api routers to use centralized aitbc package utilities

- Replace logging.getLogger with aitbc.get_logger across all router files
- Migrate HTTP client usage from httpx to aitbc.AITBCHTTPClient in blockchain.py
- Add NetworkError exception handling from aitbc package
- Update blockchain status and sync status endpoints to use AITBCHTTPClient
- Add from __future__ import annotations to admin.py, client.py, governance.py
- Consistent logger initialization across 20+ router

cli/aitbc_cli/commands/exchange_island.py

@@ -17,6 +17,14 @@ from ..utils.island_credentials import (
     get_island_id, get_island_name
 )
 
+# Import shared modules
+from aitbc.aitbc_logging import get_logger
+from aitbc.http_client import AITBCHTTPClient
+from aitbc.exceptions import NetworkError
+
+# Initialize logger
+logger = get_logger(__name__)
+
 
 # Supported trading pairs
 SUPPORTED_PAIRS = ['AIT/BTC', 'AIT/ETH']