精简若干功能，优化slug生成规则

write/src/lib/posts.ts

@@ -155,7 +155,7 @@ export function createPost(frontMatter: PostFrontMatter, content: string): strin
   const date = new Date(frontMatter.date || new Date());
   const year = date.getFullYear().toString();
   const dateStr = date.toISOString().slice(0, 10);
-  // Folder name: date + sanitized title (Chinese-friendly)
+  // Folder name: date + sanitized title (human-readable on disk)
   const titlePart = (frontMatter.title || "untitled")
     .replace(/[^\w一-鿿㐀-䶿]+/g, "-")
     .replace(/^-+|-+$/g, "")
@@ -202,7 +202,11 @@ export function updatePost(
     const newDate = new Date(merged.date || post.frontMatter.date);
     const newYear = newDate.getFullYear().toString();
     const newDateStr = newDate.toISOString().slice(0, 10);
-    const newDirName = `${newDateStr}-${frontMatter.slug}`;
+    const titlePart = (merged.title || "untitled")
+      .replace(/[^\w一-鿿㐀-䶿]+/g, "-")
+      .replace(/^-+|-+$/g, "")
+      .toLowerCase() || "post";
+    const newDirName = `${newDateStr}-${titlePart}`;
     const newDirPath = path.join(CONTENT_DIR, newYear, newDirName);
 
     if (fs.existsSync(newDirPath) && newDirPath !== post.dirPath) {