feat: add directory creation for post folder

- Implement recursive directory creation for post folder
- Ensure that parent directories are created if they don't exist

scripts/new-post.js

@@ -36,6 +36,12 @@ if (fs.existsSync(fullPath)) {
   process.exit(1)
 }
 
+// recursive mode creates multi-level directories
+const dirPath = path.dirname(fullPath)
+if (!fs.existsSync(dirPath)) {
+    fs.mkdirSync(dirPath, { recursive: true })
+}
+
 const content = `---
 title: ${args[0]}
 published: ${getDate()}