[Security] Fix RCE via unsafe eval in metadata parsing - #4207
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Replace eval() with ast.literal_eval() in modules/meta_parser.py. The metadata parser called eval() on attacker-controllable values from image metadata / the prompt-parameters input (styles, resolution, adm_guidance, freeu), allowing arbitrary code execution when importing crafted metadata. These fields only ever contain Python literals (lists/tuples of numbers and strings), so ast.literal_eval is a safe drop-in replacement that rejects any non-literal payload.
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Security fix to replace eval() with ast.literal_eval() in modules/meta_parser.py.