fix(config): 优化配置解析

- 完善 `FromLua` 转换与边界校验，拦截空洞 (`nil`) 及非整数键

src/layout.rs

@@ -1,4 +1,4 @@
-use crate::error::ShimError;
+use anyhow::{Context, Result, bail};
 use std::path::{Path, PathBuf};
 
 pub struct ShimLayout {
@@ -9,27 +9,18 @@ pub struct ShimLayout {
 
 impl ShimLayout {
     /// 从当前可执行文件解析 shim 安装目录布局
-    pub fn from_executable(exe_path: impl AsRef<Path>) -> Result<Self, ShimError> {
+    pub fn from_executable(exe_path: impl AsRef<Path>) -> Result<Self> {
         let exe_path = exe_path.as_ref();
         let bin_dir = exe_path
             .parent()
-            .ok_or_else(|| {
-                ShimError::PathResolution(format!(
-                    "无法获取程序 [{}] 的父级 bin 目录",
-                    exe_path.display()
-                ))
-            })?
+            .with_context(|| format!("无法获取程序 [{}] 的父级 bin 目录", exe_path.display()))?
             .to_path_buf();
+
         eprintln!("bin_dir目录 {}", bin_dir.display());
 
         let root_dir = bin_dir
             .parent()
-            .ok_or_else(|| {
-                ShimError::PathResolution(format!(
-                    "无法获取 bin 目录 [{}] 的父级 root 目录",
-                    bin_dir.display()
-                ))
-            })?
+            .with_context(|| format!("无法获取 bin 目录 [{}] 的父级 root 目录", bin_dir.display()))?
             .to_path_buf();
         eprintln!("root_dir 目录 {}", root_dir.display());