docs(api): add end-user lookup

[BeautyyuYanli]

Adds Service API end-user lookup endpoint to the OpenAPI specs: GET /end-users/{end_user_id}.

• Updates: Chat / Chatflow / Workflow / Completion OpenAPI JSON
• Related: feat: Service API - add end-user lookup endpoint dify#32015 (merged), Need API to get the details of a feedback dify#32018

[github-actions]

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[Copilot]

Pull request overview

This pull request adds a new end-user lookup endpoint to the OpenAPI specifications for the Dify Service API, enabling retrieval of end-user details by ID. This is useful for resolving end-user IDs returned by other APIs (e.g., the created_by field from File Upload responses). The changes are related to the merged backend implementation in langgenius/dify#32015.

Changes:

• Added GET /end-users/{end_user_id} endpoint to all four OpenAPI specs (Chat, Chatflow, Workflow, Completion)
• Added EndUserDetail schema definition with properties including id, tenant_id, app_id, type, external_user_id, name, is_anonymous, session_id, created_at, and updated_at
• Added EndUserNotFound error response (404) and "End Users" tag to all specs

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
en/api-reference/openapi_workflow.json	Added end-user lookup endpoint with $ref-based error responses, EndUserDetail schema, EndUserNotFound response component, and End Users tag
en/api-reference/openapi_completion.json	Added end-user lookup endpoint with inline error responses (matching file's existing pattern), EndUserDetail schema, and End Users tag
en/api-reference/openapi_chatflow.json	Added end-user lookup endpoint with $ref-based error responses, EndUserDetail schema, EndUserNotFound response component, and End Users tag
en/api-reference/openapi_chat.json	Added end-user lookup endpoint with $ref-based error responses, EndUserDetail schema, EndUserNotFound response component, and End Users tag

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