docs: clarify image input patterns

[MuncleUscles]

Summary

• Adds guidance for handling user-supplied image inputs without pushing large files through transaction calldata.
• Documents a URL + optional SHA-256 hash pattern so validators can independently fetch and verify image evidence before sending it to vision-capable LLMs.

Sanitized evidence basis

Recent builder support discussion included confusion around image-processing submissions, suspected transaction-size reverts, and whether the URL/hash pattern was covered in official docs. The existing Image Processing page documented raw bytes and screenshots but did not explain the safer user-upload flow.

Test plan

• pnpm build — passes.

Created by weekly docs-and-skills gap loop; draft for human review.

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