docs: restore 1 dead link(s) via Wayback (IDFGH-18021)

[mirkosalvato1-ctrl]

This PR fixes 1 broken outbound documentation link(s).

Changes:

• README_CN.md: https://www.bilibili.com/video/BV1114y1r7du/ → http://web.archive.org/web/20251230141159/https://www.bilibili.com/vid (Wayback snapshot (host dead))

Fixes #18335

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Note

Low Risk
Documentation-only URL change with no runtime, security, or build impact.

Overview
Fixes a broken outbound link in the Chinese README’s “其它参考资源” section.

The 初学者指南：主要概念和资源 entry no longer points at the dead bilibili.com URL; it now uses an Internet Archive Wayback snapshot so the beginner guide resource stays reachable.

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