Introduced `ExceptionHandlingMiddleware` to handle exceptions
globally in the application. The middleware captures exceptions
thrown during the request pipeline, logs them, and returns
appropriate HTTP responses in JSON format.
Key features:
- Handles `JobException` with a 400 Bad Request response.
- Handles unhandled exceptions with a 500 Internal Server Error.
- Logs warnings for `JobException` and errors for unhandled
exceptions.
- Sets response `ContentType` to `application/json` and writes
error details as JSON.
Added necessary `using` directives for required namespaces.
TekH
bc9f234810