赵月辉 / fastgpt-migrated

* docs(i18n): translate batch 1

* docs(i18n): translate batch 2

* docs(i18n): translate batch 3 (20 files)

- openapi/: app, share
- faq/: all 8 files
- use-cases/: index, external-integration (5 files), app-cases (4 files)

Translated using North American style with natural, concise language.
Preserved MDX syntax, code blocks, images, and component imports.

* docs(i18n): translate protocol docs

* docs(i18n): translate introduction docs (part 1)

* docs(i18n): translate use-cases docs

* docs(i18n): translate introduction docs (part 2 - batch 1)

* docs(i18n): translate final 9 files

* fix(i18n): fix YAML and MDX syntax errors in translated files

- Add quotes to description with colon in submit_application_template.en.mdx
- Remove duplicate Chinese content in translate-subtitle-using-gpt.en.mdx
- Fix unclosed details tag issue

* docs(i18n): translate all meta.json navigation files

* fix(i18n): translate Chinese separators in meta.en.json files

* translate

* translate

* i18n

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Co-authored-by: archer <archer@archerdeMac-mini.local>
Co-authored-by: archer <545436317@qq.com>