Fixes: 1) Correct `lookup_field` to `uuid` in various viewsets; 2) Replace `type=str` with `OpenApiTypes.STR` in path parameters of multiple DRF endpoints; 3) Add missing import `iscoroutinefunction` and `markcoroutinefunction`.
Extra: 1) Refactor `__call__` method in `CamelCaseMiddleWare` to separate sync and async logic; 2) Enhance documentation schema responses with precise types in multiple DRF views.
