docs(zh): fix English anchors pointing at translated Chinese headings

[simpleqt]

Description: the zh optimization/PEFT docs linked English anchors (#cpu-offloading, #model-offloading, #group-offloading, #hotswapping) while the zh pages translate those headings (CPU 卸载 / 模型卸载 / 组卸载 / 热切换), so the anchors matched nothing. Repointed at the Chinese slugs:

• docs/source/zh/optimization/speed-memory-optims.md: ./memory#model-offloading ×1, ./memory#group-offloading ×2
• docs/source/zh/tutorials/using_peft_for_inference.md: #hotswapping ×1

(Note: docs/source/zh/optimization/memory.md's remaining English anchors were already fixed upstream; this covers the rest.)

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[github-actions]

Hi @simpleqt, thanks for the PR! It does not appear to link an issue it fixes. If this PR addresses an existing issue, please add a closing keyword (e.g. Fixes #1234) to the PR description so the issue is linked. See the contribution guide for more details. If this PR intentionally does not fix a tracked issue, a maintainer can add the no-issue-needed label to silence this reminder.

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[simpleqt]

Closing — pooled into #14715 combined docs PR to reduce review overhead. All fixes are preserved in the combined branch.

[simpleqt]

Correction: my closing comment pointed to #14715 — that number was wrong. The live pooled PR is #14757 (all fixes preserved there, now rebased onto current main).