Update hot_multi.js v3 - date display, 5 topics, lazy load

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Restore to commit 5d90550 - revert 5-topic HOT and other changes

Nâng lên 5 chủ đề HOT (AI Thế Giới + AI Việt Nam + top 3) + lazy load more button

Restore 100% to commit 57980de0 - 8 files reverted

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Upload static/hot_multi.js

Restore static/hot_multi.js from commit 0280ca5 (v1: 3 topics, no pagination)

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