add dms-plugin-dev agent skill for plugin development (#2394)

.agents/skills/dms-plugin-dev/assets/templates/daemon/Daemon.qml

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+import QtQuick
+import qs.Common
+import qs.Services
+import qs.Modules.Plugins
+
+PluginComponent {
+    id: root
+    property var popoutService: null
+
+    // TODO: Read configuration from settings
+    property string configValue: pluginData?.configValue || ""
+
+    Connections {
+        target: pluginService
+        function onPluginDataChanged(changedId) {
+            if (changedId !== pluginId) return
+            configValue = pluginService.loadPluginData(pluginId, "configValue", "")
+        }
+    }
+
+    // TODO: Connect to the service events you need
+    // Connections {
+    //     target: SessionData
+    //     function onWallpaperPathChanged() {
+    //         console.log("[MyDaemon] Wallpaper changed:", SessionData.wallpaperPath)
+    //         handleEvent(SessionData.wallpaperPath)
+    //     }
+    // }
+
+    function handleEvent(data) {
+        Proc.runCommand(
+            "myDaemon.handle",
+            ["echo", "Event received:", data],
+            (stdout, exitCode) => {
+                if (exitCode === 0) {
+                    console.log("[MyDaemon] Output:", stdout)
+                } else {
+                    console.error("[MyDaemon] Failed:", exitCode)
+                    ToastService?.showInfo("Daemon action failed")
+                }
+            }
+        )
+    }
+
+    Component.onCompleted: {
+        console.log("[MyDaemon] Started")
+    }
+}

.agents/skills/dms-plugin-dev/assets/templates/daemon/Settings.qml

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+import QtQuick
+import qs.Common
+import qs.Widgets
+import qs.Modules.Plugins
+
+PluginSettings {
+    pluginId: "myDaemon"
+
+    StringSetting {
+        settingKey: "configValue"
+        label: "Configuration"
+        description: "Value used by the daemon"
+        placeholder: "Enter value..."
+        defaultValue: ""
+    }
+}

.agents/skills/dms-plugin-dev/assets/templates/daemon/plugin.json

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+{
+    "id": "myDaemon",
+    "name": "My Daemon",
+    "description": "A background service that reacts to events",
+    "version": "1.0.0",
+    "author": "Your Name",
+    "type": "daemon",
+    "capabilities": ["background-service"],
+    "component": "./Daemon.qml",
+    "icon": "settings",
+    "settings": "./Settings.qml",
+    "permissions": ["settings_read", "settings_write", "process"]
+}