fix: 移除错误的 egui crate（应为 Tauri 2，Task 2 重新脚手架）

gui/Cargo.toml

@@ -1,17 +0,0 @@
-[package]
-name = "qr-gui"
-version.workspace = true
-edition.workspace = true
-license.workspace = true
-authors.workspace = true
-
-[dependencies]
-qr-core = { path = "../core" }
-serde = { version = "1", features = ["derive"] }
-
-[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
-eframe = { version = "0.31", default-features = false, features = ["default_fonts"] }
-egui = { version = "0.31" }
-egui_extras = { version = "0.31", features = ["image"] }
-image = { version = "0.25", default-features = false, features = ["png"] }
-rfd = "0.15"

gui/src/app.rs

@@ -1,16 +0,0 @@
-//! QRGen 主应用 — eframe 入口
-
-use eframe::egui;
-
-/// QR 码生成器应用
-#[derive(Default)]
-pub struct QRGenApp;
-
-impl eframe::App for QRGenApp {
-    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
-        egui::CentralPanel::default().show(ctx, |ui| {
-            ui.heading("QR 码生成器");
-            ui.label("GUI 待实现");
-        });
-    }
-}

gui/src/lib.rs

@@ -1,6 +0,0 @@
-//! QR Code GUI — eframe/egui 桌面应用
-
-pub mod app;
-
-// Re-export main entry
-pub use app::QRGenApp;