Add PhotoRec image minimum filters

[mfaizanchaki]

Summary

• add PhotoRec options for minimum image width, height, width*height pixels, and file size
• populate JPG/PNG dimensions during header checks and enforce the image filters before recovery starts
• expose the settings through the ncurses options menu, /cmd batch mode, logs, and session save output

Batch usage example:

options,image_min_width,1024,image_min_height,768,image_min_pixels,786432,image_min_filesize,1048576,search

Fixes #167.

Testing

• ./configure
• make -j2
• make check
• PhotoRec smoke test with a raw image containing 1x1 JPG and PNG files: unfiltered recovery found both files
• PhotoRec smoke test with image_min_width=2,image_min_height=2,image_min_pixels=4,image_min_filesize=10000 rejected both files
• PhotoRec smoke test with image_min_filesize=10000 rejected both files through the existing file-too-small validation