Freegle / iznik-server / #2589

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Fix Pollinations HTTP error detection missing 429 and other errors

buildHttpContext() was not setting ignore_errors => TRUE, so
file_get_contents suppressed response headers on error responses.
This caused HTTP 429 rate limiting to be misdetected as "no data"
individual failures instead of triggering batch abort and backoff.

Also adds detection of other HTTP errors (500, etc.) in both
fetchImage() and fetchBatch() to avoid treating error response
bodies as image data.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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