capture_jpeg() has no quality factor

capture_jpeg() currently captures an image to disk and returns a blob that points to the image. The image is captured with a default Pi camera quality factor of 90 (page 39 of the Pi Camera manual). This means that even when capturing 8MP images, the file size is well below the ~3.6 MB of v2 of the OpenFlexure Microscope server code, which was based on picamera instead of picamera2

Suggest that we add an argument for quality factor, set it to either 95 or 100 by default (note that the manual suggests that 95 is the maximum, but 100 is suggested as an option in at least one thread by the picamera2 team), and then note in openflexure server v3 that this can be set when calling capture_jpeg

Locate the capture_jpeg() implementation and its callers in this Python FastAPI project, then inspect how JPEG capture options are passed to the camera. Confirm the supported quality range and choose the requested default before checking the OpenFlexure server v3 documentation context. Done means callers can provide a quality factor, the default is documented, and the resulting JPEG size or quality behavior is covered by the available checks.