Drop imajev suggestion, describe models from models.txt

The vision model picked the right upscaler about half the time on four
test photos, and llama-mtmd-cli cannot turn its thinking off: greedy
decoding loops, larger budgets cost seconds and still miss. The dropdown
now shows a one-line description per model from an optional models.txt
next to the models, so the choice stays with the user but is readable.

Document usage, model descriptions and how to test.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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