Add dedicated blog image upload config separate from product thumbs.

Introduce MULTER_BLOG_IMAGE_* and VITE_BLOG_IMAGE_* env vars with backend multer helper and CMS config wiring for prod builds.

backend/src/config/index.ts

@@ -128,6 +128,17 @@ export const getProductThumbMulterConfig = (): MulterConfig => {
     return { allowedMimes, maxFileBytes };
 };
 
+export const getBlogImageMulterConfig = (): MulterConfig => {
+    const allowedMimes = env('MULTER_BLOG_IMAGE_ALLOWED_MIMES')
+        .split(',')
+        .map(v => v.trim())
+        .filter(Boolean);
+
+    const maxFileBytes = envInt('MULTER_BLOG_IMAGE_MAX_FILE_BYTES');
+
+    return { allowedMimes, maxFileBytes };
+};
+
 export const getShopLogoMulterConfig = (): MulterConfig => {
     const allowedMimes = env('MULTER_SHOP_LOGO_ALLOWED_MIMES')
         .split(',')

backend/src/config/validate.ts

@@ -75,6 +75,16 @@ class EnvironmentVariables {
     @Max(10 * 1024 * 1024) // 10MB
     MULTER_PRODUCT_THUMB_MAX_FILE_BYTES: number;
 
+    @IsNotEmpty()
+    @IsString()
+    MULTER_BLOG_IMAGE_ALLOWED_MIMES: string;
+
+    @IsNotEmpty()
+    @IsNumber()
+    @Min(1)
+    @Max(10 * 1024 * 1024) // 10MB
+    MULTER_BLOG_IMAGE_MAX_FILE_BYTES: number;
+
     @IsNotEmpty()
     @IsString()
     MULTER_SHOP_LOGO_ALLOWED_MIMES: string;

backend/src/modules/blog/config/blogImageUpload.ts

@@ -1,4 +1,4 @@
-import { getProductThumbMulterConfig } from '../../../config';
+import { getBlogImageMulterConfig } from '../../../config';
 import { getBlogImagesDir } from '../../../config/uploadPaths';
 import { createDiskStorageUploadOptions } from '../../../utils/createDiskStorageUploadOptions';
 import { createUploadFilePipe } from '../../../utils/createUploadFilePipe';
@@ -7,6 +7,6 @@ const uploadDir = getBlogImagesDir();
 
 export const blogImageUploadOptions = createDiskStorageUploadOptions(uploadDir);
 
-const { allowedMimes, maxFileBytes } = getProductThumbMulterConfig();
+const { allowedMimes, maxFileBytes } = getBlogImageMulterConfig();
 
 export const blogImageFilePipe = createUploadFilePipe(allowedMimes, maxFileBytes);