Fixes: 1) Correct entrypoint scripts by removing redundant `python` reference in `uv run` commands; 2) Resolve incorrect imports and adjust class renaming in vibes_auth tests; 3) Address typing errors and minor omissions in existing code.
Extra: 1) Improve formatting in settings and middleware files; 2) Update messaging test class names for clarity; 3) Cleanup unused imports and extra whitespaces, ensuring cleaner codebase.
Fixes: 1) Fix shebangs in Docker entry-point scripts to use `/usr/bin/bash`.
Extra: 1) Refactor slug fields in `core` migrations for `Brand`, `Category`, and `Product`; 2) Cleanup and simplify admin code in `core/admin.py`.
