Removed the obsolete `ProcessDocument` folder and its files
(`ProcessDocumentCommand.cs`, `ProcessDocumentHandler.cs`,
`ProcessDocumentValidator.cs`) as part of Application Layer
cleanup. Updated `ROADMAP.md` to reflect progress, including
the start of `DevExpressPdfProcessor` implementation (Step 3.2)
and actionable steps for creating a test folder structure.
Documented the availability of the `DevExpress Universal License`.
09cc64eff0