Refactor code structure for improved readability and maintainability; optimize performance across multiple modules.

backend/routers/blogRouter.js

@@ -1,9 +1,8 @@
 import { Router } from 'express';
 import { authenticate } from '../middleware/authMiddleware.js';
-import multer from 'multer';
+import { imageUpload, uploadErrorHandler } from '../middleware/uploadMiddleware.js';
 import { createBlog, updateBlog, listBlogs, getBlog, createPost, listPosts, listBlogImages, uploadBlogImage, getPublicBlogImageByHash, shareBlog, resolveBlogSlug, resolveBlogSlugId } from '../controllers/blogController.js';
 
-const upload = multer();
 
 const router = Router();
 
@@ -27,6 +26,8 @@ router.post('/blogs/:id/share', authenticate, shareBlog);
 
 // Blog images: list and upload to user's Blog folder
 router.get('/blogs/:id/images', authenticate, listBlogImages);
-router.post('/blogs/:id/images', authenticate, upload.single('image'), uploadBlogImage);
+router.post('/blogs/:id/images', authenticate, imageUpload.single('image'), uploadBlogImage);
+
+router.use(uploadErrorHandler);
 
 export default router;