feat: add HTTP plugin and permissions for fetch operations

- Updated capabilities.json to include new HTTP permissions.
- Enhanced desktop-schema.json and windows-schema.json with detailed fetch operation permissions.
- Integrated the HTTP plugin in lib.rs to enable HTTP functionalities.

src-tauri/Cargo.toml

@@ -25,6 +25,7 @@ tauri = { version = "2", features = ["devtools", "tray-icon", "image-png"] }
 tauri-plugin-opener = "2"
 tauri-plugin-notification = "2"
 log = "0.4"
+tauri-plugin-http = "2"
 
 [target."cfg(target_os = \"linux\")".dependencies]
 arboard = { version = "3", features = ["wayland-data-control"] }