fix(settings): use combo box for photo format

[Resurgamz]

Replace the read-only photo format label with the standard settings combo box.

The photo output format now exposes a single JPG option, keeping the control consistent with other output settings and allowing future formats to be added without another UI rewrite.

Remove the obsolete formatLabel widget registration, implementation, and accessibility identifier.

Validation: JSON syntax check, static reference check, and git diff --check.

Related: BUG-156865

Summary by Sourcery

Replace the photo format settings label with a standard combo box control and remove the obsolete label widget wiring.

New Features:

• Expose the photo output format as a selectable settings combo box, initially offering a single JPG option.

Enhancements:

• Remove the custom format label widget implementation and its registration from the settings dialog.
• Drop the unused accessibility identifier for the photo format label from the accessibility definitions.

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Resurgamz

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Replaces the custom read-only photo format label widget with the standard settings combo box configuration, exposing a single JPG option and cleaning up obsolete widget registration and accessibility identifiers.

State diagram for photo format setting UI change

stateDiagram-v2
    state PhotoFormatSettingUI {
        ReadOnlyFormatLabel
        ComboBoxFormatOption
    }

    ReadOnlyFormatLabel --> ComboBoxFormatOption : settings_json_updated

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File-Level Changes

Change	Details	Files
Remove the custom format label widget implementation and its factory registration, migrating the photo format setting to the standard combo box configuration.	Deleted the createFormatLabelOptionHandle helper that built a DLabel-based, read-only format display wrapped in a custom layout. Removed registration of the "formatLabel" widget from the settings dialog widget factory. Ensured the photo format setting is defined in settings.json as a combo box with a single JPG option, aligned with other output settings.	src/src/mainwindow.cpp src/assets/resource/settings.json
Clean up obsolete accessibility identifiers tied to the removed format label widget.	Removed the OPTION_FORMAT_LABER accessibility define used by the deprecated format label widget. Kept other accessibility identifiers intact for remaining settings controls.	src/src/accessibility/ac-deepin-camera-define.h

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