feat(转换工具): 1. 添加模型转换示例 2. 更新 Cargo.toml 文件以包含新依赖 3. 删除过时的模型指南文档 4. 更新 README 文件以反映项目结构和使用说明

examples/convert/Cargo.toml

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+[package]
+name = "convert"
+version = "0.1.0"
+edition = "2021"
+
+[[bin]]
+name = "convert"
+path = "src/main.rs"
+
+[dependencies]
+minicpm-convert = { path = "../../crates/minicpm-convert" }
+burn = { version = "0.21", default-features = false, features = ["std", "flex"] }
+anyhow = "1.0"

examples/convert/src/main.rs

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+use burn::backend::{flex::FlexDevice, Flex};
+use minicpm_convert::{run_export, ExportTask, Format};
+use std::path::Path;
+
+fn main() -> anyhow::Result<()> {
+    let safetensors_path = Path::new("MiniCPM5-1B/model-00000-of-00001.safetensors");
+    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!("源文件: {:?}", safetensors_path);
+    println!();
+
+    let device = FlexDevice::default();
+    let tasks = vec![ExportTask::new(Format::Full)];
+
+    run_export::<Flex>(safetensors_path, config_path, tokenizer_path, &tasks, &device)?;
+
+    Ok(())
+}