feat: add dde-file-manager (dfm) client support using pure Python con…

[Zeno-sole]

…text menus

Add a new clients/dfm integration for dde-file-manager (Deepin File
Manager) using the custom action .conf file system, which provides
context menu entries for SVN and Git operations without requiring
any C compilation.

Changes:
- clients/dfm/rabbitvcs-dfm.conf — custom action definitions for file/blank context menus with SVN and Git operations. Installed to /etc/deepin/context-menus/
- clients/dfm/rabbitvcs-dfm-action — Python handler script that wraps launch_ui_window. Installed to /usr/bin/
- rabbitvcs/clients/__init__.py — package init for clients module
- rabbitvcs/clients/dfm/__init__.py — package init for dfm client
- debian/control — add rabbitvcs-dfm binary package (Arch: all)
- debian/rules — remove C compilation overrides (pure Python)
- debian/rabbitvcs-dfm.install — install .conf and action script

The custom action system places .conf files in specific paths
(/etc/deepin/context-menus/) which dde-file-manager loads at startup.
Each action entry specifies an Exec command calling rabbitvcs-dfm-action
with the appropriate VCS module name. Separators are handled via
Separator=Top on action entries.

Log: Added dde-file-manager context menu integration for RabbitVCS

Influence:
1. Verify SVN context menu actions in dde-file-manager
2. Verify Git context menu actions in dde-file-manager
3. Test both file selection and blank area menus
4. Verify separator display between SVN/Git/common sections
5. Ensure no regression on existing Nautilus/Thunar clients

feat: 使用纯Python上下文菜单为dde-file-manager添加dfm客户端支持

通过自定义操作.conf文件系统为dde-file-manager（Deepin文件管理器）
新增clients/dfm集成，提供SVN和Git操作的上下文菜单项，
无需任何C编译。

Log: 为RabbitVCS添加dde-file-manager上下文菜单集成

Influence:
1. 验证dde-file-manager中的SVN上下文菜单操作
2. 验证dde-file-manager中的Git上下文菜单操作
3. 测试文件选择和空白区域菜单
4. 验证SVN/Git/通用部分之间的分隔符显示
5. 确保现有Nautilus/Thunar客户端无回归

repo: rabbitvcs #master

[github-actions]

TAG Bot

TAG: 0.19-4deepin1
EXISTED: no
DISTRIBUTION: unstable

[Zeno-sole]

/integrate

[github-actions]

AutoIntegrationPr Bot
auto integrate with pr url: deepin-community/Repository-Integration#4153
PrNumber: 4153
PrBranch: auto-integration-27352250717

[deepin-ci-robot]

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[Zeno-sole]

/integrate