Stream remote media downloads with size limits

[rayasa07]

Summary

• stream remote image and video downloads to disk instead of reading full responses into memory
• enforce media byte limits from Content-Length and during chunked writes
• remove partial download files when a stream exceeds the configured limit

Validation

• scripts/run_tests.sh tests/tools/test_vision_tools.py tests/tools/test_video_analyze.py

[alt-glitch]

Related to #10440 (stream vision downloads before size checks) and #13145 (no size cap on inbound media downloads). Also related to #13341 (cap inbound media bytes). This PR addresses the same streaming + size limit concern for vision_tools.py.

[teknium1]

Closing in favor of #50321 — #50321 — which streams remote media downloads with a configurable size limit in the shared cache helpers.

Your "stream with size limits" approach matches what landed. The merged fix is credited to @sgaofen (#13341, the earliest report of this), reapplied onto current main with the video guard and a config.yaml knob added. Thanks for the contribution.