fix: update HTML title to mockupAWS

- Change generic 'frontend' title to 'mockupAWS - AWS Cost Simulator'
- Resolves frontend branding issue identified in testing

src/core/database.py

@@ -6,7 +6,7 @@ from sqlalchemy.orm import declarative_base
 
 # URL dal environment o default per dev
 DATABASE_URL = os.getenv(
-    "DATABASE_URL", "postgresql+asyncpg://app:changeme@localhost:5432/mockupaws"
+    "DATABASE_URL", "postgresql+asyncpg://postgres:postgres@localhost:5432/mockupaws"
 )
 
 # Engine async