refactor: 删除部分多余的代码和注释

src/utils/fs.rs

@@ -0,0 +1,23 @@
+//! Small filesystem helpers.
+
+use std::path::Path;
+
+/// Read a UTF-8 file and trim surrounding whitespace.
+pub fn read_trimmed(path: &Path) -> Option<String> {
+    std::fs::read_to_string(path)
+        .ok()
+        .map(|value| value.trim().to_string())
+}
+
+/// Sorted list of directory entry names (lossy exclusion on non-UTF8).
+pub fn list_dir_names(path: &Path) -> Vec<String> {
+    let mut names = std::fs::read_dir(path)
+        .ok()
+        .into_iter()
+        .flatten()
+        .flatten()
+        .filter_map(|entry| entry.file_name().into_string().ok())
+        .collect::<Vec<_>>();
+    names.sort();
+    names
+}