MEDIA_DELIVERY_EXTS in gateway/platforms/base.py omitted .3gp, causing
MEDIA: tags with .3gp files to leak as plain text instead of being
extracted for native video delivery. _VIDEO_EXTS in
tools/send_message_tool.py and _MIGRATION_VIDEO_EXTS in the Feishu
adapter omitted .webm, causing .webm files to be classified as
documents instead of video on Telegram and other platforms.
Both extensions are already present in every gateway-side _VIDEO_EXTS
definition (run.py, kanban_watchers.py, weixin.py, base.py local).
Closes#71621, Closes#71603
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