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/mod.rs

@@ -0,0 +1,28 @@
+use anyhow::Result;
+
+// Common result type used by command functions
+pub type CmdResult<T = ()> = Result<T, String>;
+
+// Command modules
+pub mod profile;
+pub mod validate;
+pub mod uwp;
+pub mod webdav;
+pub mod app;
+pub mod network;
+pub mod clash;
+pub mod verge;
+pub mod runtime;
+pub mod save_profile;
+
+// Re-export all command functions for backwards compatibility
+pub use profile::*;
+pub use validate::*;
+pub use uwp::*;
+pub use webdav::*;
+pub use app::*;
+pub use network::*;
+pub use clash::*;
+pub use verge::*;
+pub use runtime::*;
+pub use save_profile::*;