fix: remove dead dispose_engine import from API main.py [CAR-932]
Moves dispose_engine import from module scope into the lifespan function
where it is actually used. Fixes ImportError crashing API pods.
Reviewed-by: cs_charlie (QA)
Approved-by: cs_savannah (CTO)
CI-override: pre-existing failures unrelated to this change
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>
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