Expand aitbc package with new utility modules and enhanced HTTP client

- Add new exception types: RetryError, CircuitBreakerOpenError, RateLimitError
- Enhance AITBCHTTPClient with retry logic, caching, circuit breaker, and rate limiting
- Add AsyncAITBCHTTPClient for async HTTP operations
- Add crypto module with Ethereum key derivation, signing, encryption, and hashing utilities
- Add web3_utils module with Web3Client and create_web3_client
- Add security module with token generation, API key management

apps/coordinator-api/scripts/migrate_complete.py

@@ -7,8 +7,10 @@ from psycopg2.extras import RealDictCursor
 import json
 from decimal import Decimal
 
+from aitbc.constants import DATA_DIR
+
 # Database configurations
-SQLITE_DB = "/var/lib/aitbc/data/coordinator.db"
+SQLITE_DB = str(DATA_DIR / "data/coordinator.db")
 PG_CONFIG = {
     "host": "localhost",
     "database": "aitbc_coordinator",