Add intro docs for different app types

[RiskeyL]

No description provided.

[Copilot]

Pull request overview

This PR updates the Dify documentation navigation metadata (sidebar titles/icons), adds new “Build” section pages for core app types (Workflow/Chatflow, Text Generator, Chatbot, Agent), and introduces a new screenshot asset referenced by the Agent page.

Changes:

• Added new build docs: Workflow & Chatflow overview, Text Generator guide, Chatbot guide, and Agent guide.
• Updated knowledge docs frontmatter to refine sidebar titles and add icons.
• Added a new image asset images/tool_name.png used in the Agent doc.

Reviewed changes

Copilot reviewed 9 out of 13 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
images/tool_name.png	Adds a screenshot referenced in the new Agent documentation.
en/use-dify/knowledge/metadata.mdx	Updates sidebar title and adds an icon to improve nav presentation.
en/use-dify/knowledge/manage-knowledge/maintain-knowledge-documents.mdx	Renames sidebar title for clearer navigation labeling.
en/use-dify/knowledge/manage-knowledge/maintain-dataset-via-api.mdx	Adds a sidebar title to improve navigation labeling.
en/use-dify/knowledge/manage-knowledge/introduction.mdx	Renames sidebar title for clearer navigation labeling.
en/use-dify/knowledge/integrate-knowledge-within-application.mdx	Adds a sidebar title to improve navigation labeling.
en/use-dify/build/workflow-chatflow.mdx	New overview page explaining workflow vs. chatflow.
en/use-dify/build/text-generator.mdx	New guide for configuring and using Text Generator apps.
en/use-dify/build/chatbot.mdx	New guide for configuring and using Chatbot apps.
en/use-dify/build/agent.mdx	New guide for configuring and using Agent apps, including tools and retrieval.

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[Copilot]

/en/use-dify/build/app-toolkit is referenced here, but there is no app-toolkit.mdx (or equivalent) under en/use-dify/build/, so this will be a broken link. Please point this to an existing page that covers these features (or add the missing App Toolkit page).

Suggested change

	Agents also support optional features like conversation openers, follow-up suggestions, text to speech, speech to text, citations and attributions, content moderation, and annotation replies. See [App Toolkit](/en/use-dify/build/app-toolkit) for details.
	Agents also support optional features like conversation openers, follow-up suggestions, text to speech, speech to text, citations and attributions, content moderation, and annotation replies. See [App Toolkit](/en/use-dify/build/README) for details.

[Copilot]

/en/use-dify/build/app-toolkit is linked here, but there’s no corresponding page under en/use-dify/build/ in this repo. Please update the link to an existing page that documents these optional features (or add the missing page) to prevent a broken link in the published docs.

Suggested change

	Chatbots also support optional features like conversation openers, follow-up suggestions, text to speech, speech to text, citations and attributions, content moderation, and annotation replies. See [App Toolkit](/en/use-dify/build/app-toolkit) for details.
	Chatbots also support optional features like conversation openers, follow-up suggestions, text to speech, speech to text, citations and attributions, content moderation, and annotation replies. See [App Toolkit](/en/use-dify/build/README) for details.

[Copilot]

/en/use-dify/build/app-toolkit is referenced, but there is no page at that path in the repository. Please change this link to an existing doc covering these features (or add the missing page) so readers don’t hit a 404.

Suggested change

	Text Generators also support optional features like generating multiple outputs at once, text to speech, and content moderation. See [App Toolkit](/en/use-dify/build/app-toolkit) for details.
	Text Generators also support optional features like generating multiple outputs at once, text to speech, and content moderation. See [Build Overview](/en/use-dify/build/README) for details.