docs: add "Forgot Password" docs

[zhangzhonghe]

Related PR nocobase/nocobase#6616

[Copilot]

Pull Request Overview

This PR adds documentation for the new “Forgot Password” feature along with administrative configuration guidance and a user flow description. It also refines the sign up form settings section by replacing the info block with an inline Badge for version information.

• Added a new “Forgot Password” section and detailed admin configuration steps.
• Updated the sign up form settings to use an inline component for version info.
• Applied changes consistently across Chinese, Japanese, French, and English documentation.

Reviewed Changes

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

File	Description
docs/zh-CN/handbook/auth/user/index.md	Updated sign up form section and added “Forgot Password” docs in Chinese
docs/ja-JP/handbook/auth/user/index.md	Added “Forgot Password” section and updated formatting in Japanese
docs/fr-FR/handbook/auth/user/index.md	Added “Forgot Password” section and updated formatting in French
docs/en-US/handbook/auth/user/index.md	Added “Forgot Password” section and updated formatting in English

Comments suppressed due to low confidence (4)

docs/zh-CN/handbook/auth/user/index.md:65

• Verify that the inline component is fully supported by the markdown renderer to ensure consistent display across documentation pages.

### 忘记密码<Badge>v1.7.0+</Badge>

docs/ja-JP/handbook/auth/user/index.md:55

• Confirm that the inline component renders correctly in the Japanese documentation to maintain formatting consistency.

### パスワードを忘れた場合<Badge>v1.7.0+</Badge>

docs/fr-FR/handbook/auth/user/index.md:65

• Ensure that the inline element is supported by the documentation renderer to avoid any rendering issues in the French version.

### Mot de passe oublié<Badge>v1.7.0+</Badge>

docs/en-US/handbook/auth/user/index.md:65

• Check that the inline component renders as expected in the English documentation to ensure visual consistency.

### Forgot Password<Badge>v1.7.0+</Badge>