修正windows下无法保存的问题

src/modules/lecture/infrastructure/platform/paths.ts

@@ -22,6 +22,43 @@ export function joinPath(...parts: string[]): string {
   return PathUtils.join(...parts.filter(Boolean));
 }
 
+/** Normalize a filesystem path for the current OS. */
+export function normalizeStoragePath(input: string): string {
+  const trimmed = (input || "").trim();
+  if (!trimmed) return "";
+  const joined = trimmed.replace(/[\\/]+/g, "/");
+  if (/^[A-Za-z]:\//.test(joined)) {
+    const drive = joined.slice(0, 2);
+    const rest = joined
+      .slice(2)
+      .split("/")
+      .filter((part) => part && part !== ".")
+      .join("\\");
+    return `${drive}\\${rest}`.replace(/\\+$/, "");
+  }
+  return joined
+    .split("/")
+    .filter((part) => part && part !== ".")
+    .join("/")
+    .replace(/\/+$/, "");
+}
+
+/** Safe single path segment for file or directory names (cross-platform). */
+export function sanitizePathSegment(input: string, maxLen = 120): string {
+  const cleaned = String(input || "")
+    .replace(/[<>:"/\\|?*\x00-\x1f]/g, "_")
+    .replace(/[.\s]+$/, "")
+    .trim();
+  if (!cleaned) return "_";
+  if (cleaned.length <= maxLen) return cleaned;
+  let hash = 0;
+  for (let i = 0; i < input.length; i++) {
+    hash = (hash * 31 + input.charCodeAt(i)) | 0;
+  }
+  const tail = Math.abs(hash).toString(36);
+  return `${cleaned.slice(0, Math.max(1, maxLen - tail.length - 1))}_${tail}`;
+}
+
 /** Convert local file path to file:// URL for <audio src>. */
 export function pathToFileUrl(filePath: string): string {
   const normalized = filePath.replace(/\\/g, "/");