docs: sync documentation for Dify v1.13.0–v1.13.3 changes

[RiskeyL]

Summary

• Add doc_form validation error to knowledge API spec 400 responses (EN/ZH/JA) per fix: Add the missing validation of doc_form in the service API. dify#32892
• Rename "Message Credits" → "AI Credits" and "System Model Settings" → "Default Model Settings" across docs, glossary, and translation termbase per
  feat: enhance model plugin workflow checks and model provider management UX dify#33289
• Add "Usage Priority" and "API Key" glossary entries
• Fix release-sync skill to note that environments.mdx requires manual ZH/JA translation

Changes by track

API reference (openapi_knowledge.json × 3 languages):

• doc_form validation error added to invalid_param on 4 document create/update endpoints

Terminology (glossary, termbase, quick-start, tutorials):

• "Message Credits" → "AI Credits" (EN/ZH/JA)
• "System Model Settings" → "Default Model Settings" (EN/ZH/JA)
• 2 new glossary entries: Usage Priority, API Key

Skill (dify-docs-release-sync):

• Added step 1.3 doc-status check, updated report template with Doc Status column
• Env var section now instructs manual ZH/JA update (file is in translation ignore list)

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Project	Status	Preview	Updated (UTC)
dify-core-product	🟢 Ready	View Preview	Mar 30, 2026, 10:50 AM

[Copilot]

Pull request overview

Updates the docs repo to reflect Dify v1.13.0–v1.13.3 product/API/terminology changes, keeping the OpenAPI knowledge spec, glossary/termbase, and release-sync skill aligned with recent upstream updates.

Changes:

• Add doc_form validation error messaging to Knowledge API 400 responses (EN/ZH/JA OpenAPI specs).
• Rename UI terminology (“Message Credits” → “AI Credits”, “System Model Settings” → “Default Model Settings”) and add new glossary entries.
• Update dify-docs-release-sync skill to compare two version refs and document the manual ZH/JA update requirement for environments.mdx.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
zh/api-reference/openapi_knowledge.json	Adds doc_form invalid-param details to 400 responses in ZH Knowledge OpenAPI.
ja/api-reference/openapi_knowledge.json	Adds doc_form invalid-param details to 400 responses in JA Knowledge OpenAPI.
en/api-reference/openapi_knowledge.json	Adds doc_form invalid-param details to 400 responses in EN Knowledge OpenAPI.
writing-guides/glossary.md	Renames UI labels and adds “Usage Priority” + “API Key” glossary entries.
tools/translate/termbase_i18n.md	Updates termbase UI labels for renamed strings.
en/use-dify/getting-started/quick-start.mdx	Updates quick-start wording to “AI credits” and “Default Model Settings”.
ja/use-dify/getting-started/quick-start.mdx	Updates quick-start wording to “AIクレジット” and “デフォルトモデル設定”.
.claude/skills/dify-docs-release-sync/SKILL.md	Refactors the skill to diff two refs, adds doc-status reporting, and documents manual ZH/JA env var doc updates.

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