feat(api): include tags in app information response

[fujita-h]

Summary

Add a list of tag names to {api}/v1/info.

Screenshots

Before

{
    "name": "chat app 1",
    "description": "chat app 1 description"
}

After

{
    "name": "chat app 1",
    "description": "chat app 1 description",
    "tags": [
        "tag_1",
        "tag_2"
    ]
}

Checklist

Important

Please review the checklist below before submitting your pull request.

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods