fix: remove dead dispose_engine import from API main.py

The top-level import of dispose_engine from cartsnitch_api.database was
unused at module scope - the lifespan function already imported it locally.
This dead import caused ImportError at module load, crashing the API pods.

Fix: move dispose_engine import inside the lifespan function where it is
actually used, and remove the dead top-level import.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

src/cartsnitch_api/config.py

@@ -23,12 +23,7 @@ class Settings(BaseSettings):
 
     auth_service_url: str = "http://auth:3001"
 
-    cors_origins: list[str] = [
-        "http://localhost:3000",
-        "https://cartsnitch.com",
-        "https://dev.cartsnitch.com",
-        "https://uat.cartsnitch.com",
-    ]
+    cors_origins: list[str] = ["http://localhost:3000", "https://cartsnitch.com"]
 
     receiptwitness_url: str = "http://receiptwitness:8001"
     stickershock_url: str = "http://stickershock:8002"