refactor: rename cmds module to cmd for better consistency (#2830)

- Renamed `cmds` module to `cmd` for better naming consistency
- Reorganized command modules into separate files under src/cmd/
- Updated all imports and references to use the new module name
- Fixed missing dependency in webdav.rs to reference core::backup
- Updated tray module to use new cmd namespace
- Improved uwp.rs module structure using platform-specific implementations
- Removed unnecessary imports from various command files

src-tauri/src/cmd/uwp.rs

@@ -0,0 +1,29 @@
+use super::CmdResult;
+
+/// Platform-specific implementation for UWP functionality
+#[cfg(windows)]
+mod platform {
+    use super::CmdResult;
+    use crate::core::win_uwp;
+    use crate::wrap_err;
+
+    pub async fn invoke_uwp_tool() -> CmdResult {
+        wrap_err!(win_uwp::invoke_uwptools().await)
+    }
+}
+
+/// Stub implementation for non-Windows platforms
+#[cfg(not(windows))]
+mod platform {
+    use super::CmdResult;
+
+    pub async fn invoke_uwp_tool() -> CmdResult {
+        Ok(())
+    }
+}
+
+/// Command exposed to Tauri
+#[tauri::command]
+pub async fn invoke_uwp_tool() -> CmdResult {
+    platform::invoke_uwp_tool().await
+}