feat(shortcut): add custom shortcut CRUD and display-only support

Add runtime custom shortcut CRUD (AddCustomShortcut/ModifyCustomShortcut/DeleteCustomShortcut) to KeybindingManager with input validation, conflict handling and commit-failure rollback. Add GetShortcutCommand so the control center can fetch a custom shortcut command separately.

Persist runtime custom shortcuts through user-level DConfig plus a custom shortcut subpath registry. Keep Add on full save/create semantics, use updateCustomShortcut for Modify so existing entries update only changed fields, and roll back persisted state when registration or conflict persistence fails.

Introduce display-only shortcut configs so modifiable shortcuts with no hotkey remain visible as "None" after their binding is taken. Keep these entries in the runtime map and expose them through ListAllShortcuts.

Remove the unused checkConflictForConfig helper after conflict checks stayed on the actual LookupConflictShortcut/registerShortcut paths.

新增自定义快捷键运行时增删改（AddCustomShortcut/ModifyCustomShortcut/DeleteCustomShortcut），包含输入校验、冲突处理和提交失败回滚；新增 GetShortcutCommand，供控制中心单独获取自定义快捷键命令。

通过用户级 DConfig 和自定义快捷键 subpath 注册表持久化运行时自定义快捷键。Add 继续使用完整创建/保存语义，Modify 改用 updateCustomShortcut，仅更新已有条目的变化字段，并在注册或冲突持久化失败时回滚持久化状态。

引入 display-only 快捷键配置，使可修改但无热键的快捷键在绑定被其他快捷键占用后仍能以“无”显示。此类条目保留在运行时映射中，并通过 ListAllShortcuts 暴露。

删除未使用的 checkConflictForConfig 辅助函数，因为真实冲突检测仍走 LookupConflictShortcut/registerShortcut 路径。

Log: feat(shortcut): add custom shortcut CRUD and display-only support
Change-Id: Ie59dd3cb4e2575eea15974b9454eefc0ff484bfa

Author: yixinshark

src/plugin-qt/shortcut/CMakeLists.txt

@@ -27,11 +27,13 @@ set(SHORTCUT_SRC_DIR ${CMAKE_CURRENT_SOURCE_DIR}/src)
 set(SHORTCUT_COMMON_SOURCES
     ${SHORTCUT_SRC_DIR}/core/shortcutmanager.cpp
     ${SHORTCUT_SRC_DIR}/core/keybindingmanager.cpp
+    ${SHORTCUT_SRC_DIR}/core/customshortcuttransaction.cpp
     ${SHORTCUT_SRC_DIR}/core/gesturemanager.cpp
     ${SHORTCUT_SRC_DIR}/core/qkeysequenceconverter.cpp
     ${SHORTCUT_SRC_DIR}/core/actionexecutor.cpp
     ${SHORTCUT_SRC_DIR}/core/translationmanager.cpp
     ${SHORTCUT_SRC_DIR}/config/configloader.cpp
+    ${SHORTCUT_SRC_DIR}/config/customshortcutstore.cpp
     ${SHORTCUT_SRC_DIR}/backend/abstractkeyhandler.h
     ${SHORTCUT_SRC_DIR}/backend/abstractgesturehandler.h
     ${SHORTCUT_SRC_DIR}/backend/specialkeyhandler.cpp
@@ -113,6 +115,12 @@ foreach(SUBDIR_PATH ${SHORTCUT_CONFIG_SUBDIRS})
     )
 endforeach()
 
+# install base json config
+dtk_add_config_meta_files(
+    APPID "org.deepin.dde.keybinding"
+    FILES "${CMAKE_CURRENT_SOURCE_DIR}/configs/org.deepin.shortcut.json"
+)
+
 foreach(SUBDIR_PATH ${GESTURE_CONFIG_SUBDIRS})
     dtk_add_config_meta_files(
         APPID "org.deepin.dde.keybinding"

src/plugin-qt/shortcut/configs/org.deepin.dde.keybinding.shortcut.displayswitch/org.deepin.shortcut.json

@@ -26,12 +26,12 @@
             "value": [
                 "Meta+P"
             ],
-            "serial": 0,
+            "serial": 1,
             "flags": [],
             "name": "hotkeys",
             "name[zh_CN]": "快捷键组合",
             "description": "切换显示模式快捷键组合",
-            "permissions": "",
+            "permissions": "readwrite",
             "visibility": "private"
         },
         "triggerType": {

src/plugin-qt/shortcut/configs/org.deepin.shortcut.json

@@ -0,0 +1,86 @@
+{
+    "magic": "dsg.config.meta",
+    "version": "1.0",
+    "contents": {
+        "appId": {
+            "value": "org.deepin.dde.keybinding",
+            "serial": 0,
+            "flags": [],
+            "name": "appId",
+            "name[zh_CN]": "提供快捷键应用Id",
+            "description": "provide shortcut app id",
+            "permissions": "readwrite",
+            "visibility": "private"
+        },
+        "displayName": {
+            "value": "",
+            "serial": 0,
+            "flags": [],
+            "name": "displayName",
+            "name[zh_CN]": "",
+            "description": "",
+            "permissions": "readwrite",
+            "visibility": "private"
+        },
+        "hotkeys": {
+            "value": [],
+            "serial": 0,
+            "flags": [],
+            "name": "hotkeys",
+            "name[zh_CN]": "快捷键组合",
+            "description": "打开默认终端快捷键组合",
+            "permissions": "readwrite",
+            "visibility": "private"
+        },
+        "triggerType": {
+            "value": 1,
+            "serial": 0,
+            "flags": [],
+            "name": "triggerType",
+            "name[zh_CN]": "快捷键触发动作类型",
+            "description": "二进制command类型",
+            "permissions": "readwrite",
+            "visibility": "private"
+        },
+        "triggerValue": {
+            "value": [],
+            "serial": 0,
+            "flags": [],
+            "name": "triggerValue",
+            "name[zh_CN]": "快捷键触发动作",
+            "description": "",
+            "permissions": "readwrite",
+            "visibility": "private"
+        },
+        "category": {
+            "value": "Custom",
+            "serial": 1,
+            "flags": [],
+            "name": "category",
+            "name[zh_CN]": "快捷键类别（Custom）",
+            "description": "Custom shortcut category",
+            "permissions": "readwrite",
+            "visibility": "private"
+        },
+        "enabled": {
+            "value": true,
+            "serial": 0,
+            "flags": [],
+            "name": "enabled",
+            "name[zh_CN]": "使能",
+            "description": "是否启用快捷键",
+            "permissions": "readwrite",
+            "visibility": "private"
+        },
+        "modifiable": {
+            "value": true,
+            "serial": 0,
+            "flags": [],
+            "name": "modifiable",
+            "name[zh_CN]": "能否修改快捷键",
+            "description": "不能修改快捷键",
+            "permissions": "readwrite",
+            "visibility": "private"
+        }
+    }
+}