docs: add i18n translations for de/es/fr/it/ja/ko/pt_BR/zh_TW

[kejhz653-stack]

Summary

• Add machine-translated PO files for 8 new documentation locales: de, es, fr, it, ja, ko, pt_BR, zh_TW
• Translations are based on the zh_CN template using DeepSeek API
• Add init_locales.py scaffold script for generating locale PO file structure
• Update doc/Makefile with per-language HTML build targets and html_i18n to build all at once
• Update switcher.json with all 9 language entries and RTD URLs

Preview

Language	URL
Japanese	https://inference-i18n-ja.readthedocs.io/
Korean	https://inference-i18n-ko.readthedocs.io/
German	https://inference-i18n-de.readthedocs.io/
French	https://inference-i18n-fr.readthedocs.io/
Spanish	https://inference-i18n-es.readthedocs.io/
Italian	https://inference-i18n-it.readthedocs.io/
Portuguese (Brazil)	https://inference-i18n-pt-br.readthedocs.io/
Traditional Chinese	https://inference-i18n-zh-tw.readthedocs.io/

Test plan

• Verify RTD builds succeed for each language after merge
• Configure RTD translation sub-projects on the main inference project for each new locale

[gemini-code-assist]

Code Review

This pull request adds multi-language localization support to the project, introducing translated README files and documentation scaffolding for German, Spanish, French, Italian, Korean, Portuguese, and Traditional Chinese, alongside updates to the documentation build system. The reviewer feedback identifies that several reference-style links in the new README files are missing their definitions and should be converted to inline links. Additionally, the zh_TW locale should be included in the translate-po target within doc/Makefile to ensure its translations are correctly updated.

Important

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[gemini-code-assist]

The reference-style links [DeepSeek V4] and [MiniMax-M2.7] are missing their link definitions at the bottom of the file, causing them to render as plain text instead of clickable links. Please convert them to inline links as suggested. Note that this issue also systematically affects all other newly added translated README files (README_es.md, README_fr.md, README_it.md, README_ko.md, README_pt_BR.md, README_zh_TW.md).

Suggested change

	- Eingebaute [DeepSeek V4]: [#4938](https://github.com/xorbitsai/inference/pull/4938)
	- Eingebaute [MiniMax-M2.7]: [#4843](https://github.com/xorbitsai/inference/pull/4843)
	- Eingebaute [DeepSeek V4](https://api-docs.deepseek.com/news/news260424): [#4938](https://github.com/xorbitsai/inference/pull/4938)
	- Eingebaute [MiniMax-M2.7](https://www.minimax.io/models/text/m27): [#4843](https://github.com/xorbitsai/inference/pull/4843)

[gemini-code-assist]

The reference-style links [LlamaIndex], [Dify], and [Chatbox] are missing their link definitions at the bottom of the file. Please convert them to inline links as suggested. This issue also systematically affects all other newly added translated README files.

Suggested change

🔌 **Third-Party-Integrationen**: Nahtlose Integration mit [LangChain](https://python.langchain.com/docs/integrations/providers/xinference), [LlamaIndex], [Dify], [Chatbox] u. a.

🔌 **Third-Party-Integrationen**: Nahtlose Integration mit [LangChain](https://python.langchain.com/docs/integrations/providers/xinference), [LlamaIndex](https://gpt-index.readthedocs.io/en/stable/examples/llm/XinferenceLocalDeployment.html#i-run-pip-install-xinference-all-in-a-terminal-window), [Dify](https://docs.dify.ai/advanced/model-configuration/xinference), [Chatbox](https://chatboxai.app/) u. a.

[gemini-code-assist]

The zh_TW locale is missing from the --locales list in the translate-po target. Since Traditional Chinese is one of the newly added locales, please include zh_TW in this list to ensure it gets translated/updated when running make translate-po.

	python $(SOURCEDIR)/translate_po.py --locales ja ko de fr es it pt_BR zh_TW