feat(转换工具): 1. 更新依赖库 burn，启用 wgpu、fusion 和 autotune 特性 2. 修改主程序以使用 Wgpu 设备进行模型转换 3. 更新输出信息以反映 GPU 加速

examples/convert/src/main.rs

@@ -1,4 +1,4 @@
-use burn::backend::{flex::FlexDevice, Flex};
+use burn::backend::{wgpu::WgpuDevice, Wgpu};
 use minicpm_convert::{run_export, ExportTask, Format};
 use std::path::Path;
 
@@ -7,14 +7,14 @@ fn main() -> anyhow::Result<()> {
     let config_path = Path::new("MiniCPM5-1B/config.json");
     let tokenizer_path = Path::new("MiniCPM5-1B/tokenizer.json");
 
-    println!("模型转换工具");
+    println!("模型转换工具 (Wgpu GPU 加速)");
     println!("源文件: {:?}", safetensors_path);
     println!();
 
-    let device = FlexDevice::default();
+    let device = WgpuDevice::default();
     let tasks = vec![ExportTask::new(Format::Full)];
 
-    run_export::<Flex>(safetensors_path, config_path, tokenizer_path, &tasks, &device)?;
+    run_export::<Wgpu>(safetensors_path, config_path, tokenizer_path, &tasks, &device)?;
 
     Ok(())
-}
+}