fix: Remove unused config references

[calsys456]

These configuration fields is actually not used in anywhere, and will be removed by recent ddm refactor.

Summary by Sourcery

Remove unused user avatar configuration references from the greeter user model.

Enhancements:

• Remove unused theme configuration access in UserModel constructor.
• Drop unused disableAvatarsThreshold property and static accessor from UserModel interface.

[calsys456]

Paired with linuxdeepin/ddm#58

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Removes unused configuration references from the greeter UserModel, simplifying the API and eliminating dead code related to avatar configuration and theme faces directory.

Class diagram for UserModel before and after removing unused config references

classDiagram
    class UserModel_Before {
        <<QAbstractListModel>>
        %% Q_PROPERTY declarations
        int lastIndex
        QString lastUser
        int count
        int disableAvatarsThreshold
        bool containsAllUsers

        %% Methods
        +void setCurrentUserName(QString userName)
        +void updateUserLoginState(QString username, bool logined)
        +void clearUserLoginState()
        +static int disableAvatarsThreshold()
        +bool containsAllUsers() const
    }

    class UserModel_After {
        <<QAbstractListModel>>
        %% Q_PROPERTY declarations
        int lastIndex
        QString lastUser
        int count
        bool containsAllUsers

        %% Methods
        +void setCurrentUserName(QString userName) noexcept
        +void updateUserLoginState(QString username, bool logined)
        +void clearUserLoginState()
        +bool containsAllUsers() const
    }

    UserModel_Before <|-- UserModel_After

Loading

File-Level Changes

Change	Details	Files
Remove use of unused theme configuration fields in UserModel implementation.	Drop retrieval of Theme.FacesDir config value from the UserModel constructor since it is unused Remove the disableAvatarsThreshold() static method implementation that just forwarded mainConfig.Theme.DisableAvatarsThreshold	src/greeter/usermodel.cpp
Simplify UserModel interface by removing an unused QML‑exposed property and its accessor.	Remove Q_PROPERTY disableAvatarsThreshold from the UserModel class so it is no longer exposed to QML Delete the declaration of the static disableAvatarsThreshold() accessor from the UserModel public API	src/greeter/usermodel.h

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[sourcery-ai]

Hey - I've left some high level feedback:

• Since disableAvatarsThreshold is removed as a Q_PROPERTY, double-check that no QML code still binds to it or expects it on UserModel, as that would now fail at runtime.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Since `disableAvatarsThreshold` is removed as a `Q_PROPERTY`, double-check that no QML code still binds to it or expects it on `UserModel`, as that would now fail at runtime.

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: calsys456, zccrs

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• debian/deepin/OWNERS

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