fix(shops): parse multipart logo upload on PATCH /shops/:id/logo

req.files.logo relied on an express-form-data style parser that was
removed app-wide, so the route never had a multipart parser and every
logo upload failed with "لطفاً لوگوی فروشگاه را انتخاب کنید" even
though the client had already picked and sent an image. Add the same
multer-based pattern already used for profile_image and shop-products
image uploads.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

routes/application/shops/index.js

@@ -1,4 +1,7 @@
 const express = require('express')
+const multer = require('multer')
+const fs = require('fs')
+const path = require('path')
 const {
   createDraftShop,
   getMyShops,
@@ -29,6 +32,23 @@ const requireSubUserPermission = require('../../../middlewares/requireSubUserPer
 
 const router = express.Router()
 
+// req.files مثلِ قبلاً توسطِ express-form-data پر می‌شد؛ بعدِ حذفِ اون middleware
+// (تداخل با multer توی posts/chat) این روت بدونِ parser جایگزین مونده بود — یعنی
+// آپلودِ لوگوی فروشگاه همیشه با «لطفاً لوگو را انتخاب کنید» رد می‌شد
+const shopLogoTmpDir = '/tmp/modstagram-uploads'
+if (!fs.existsSync(shopLogoTmpDir)) {
+  fs.mkdirSync(shopLogoTmpDir, { recursive: true })
+}
+const shopLogoUpload = multer({
+  storage: multer.diskStorage({
+    destination: (req, file, cb) => cb(null, shopLogoTmpDir),
+    filename: (req, file, cb) => {
+      cb(null, `${Date.now()}-${Math.round(Math.random() * 1e9)}${path.extname(file.originalname || '')}`)
+    }
+  }),
+  limits: { fileSize: 50 * 1024 * 1024 }
+}).single('logo')
+
 router.post('/draft', [blockCheck], requireSubUserPermission('create_shop'), createDraftShop)
 router.get('/mine', [blockCheck], getMyShops)
 router.get('/analytics', [blockCheck], getShopAnalytics)
@@ -44,7 +64,7 @@ router.post('/favorites/toggle', [blockCheck], toggleFavorite)
 router.get('/public/:id', getShopPublic)
 router.get('/:id', [blockCheck], getShopById)
 router.patch('/:id/basic', [blockCheck], requireSubUserPermission('create_shop'), updateShopBasic)
-router.patch('/:id/logo', [blockCheck], requireSubUserPermission('create_shop'), updateShopLogo)
+router.patch('/:id/logo', [blockCheck], requireSubUserPermission('create_shop'), shopLogoUpload, updateShopLogo)
 router.patch('/:id/shipping', [blockCheck], requireSubUserPermission('create_shop'), updateShopShipping)
 router.patch('/:id/location', [blockCheck], requireSubUserPermission('create_shop'), updateShopLocation)
 router.patch('/:id/contact', [blockCheck], requireSubUserPermission('create_shop'), updateShopContact)