File overwritting while multiple-processing codecs.

While using Nimble, CADOrchestrator. Handling multiple request on parallel is not currently possible, as the files are fixed named under /tmp in linux for example. "temp_stl.stl", "temp_dxf.dxf". Multiple processing would try to write/read the same files, creating bottlenecks and other unwanted overwriting conditions.

Inspect the CLI's temporary-file handling for Nimble and CADOrchestrator codec processing, then reproduce two requests running in parallel on Linux. Done means concurrent processing uses request-specific temporary paths and no longer overwrites or reads another request's files.

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