Move upload caps into validation config env vars.

Replace MAX_IMAGES_PER_UPLOAD with VALIDATION_UPLOAD_* limits mirrored on the frontend VITE_* names.

backend/src/config/validate.ts

@@ -45,12 +45,6 @@ class EnvironmentVariables {
     @IsString()
     CORS_ORIGINS: string;
 
-    @IsNotEmpty()
-    @IsNumber()
-    @Min(1)
-    @Max(100)
-    MAX_IMAGES_PER_UPLOAD: number;
-
     @IsNotEmpty()
     @IsNumber()
     @Min(1)
@@ -100,6 +94,18 @@ class EnvironmentVariables {
     @Min(1)
     @Max(10_000)
     THROTTLE_UPLOAD_LIMIT: number;
+
+    @IsNotEmpty()
+    @IsNumber()
+    @Min(1)
+    @Max(100)
+    VALIDATION_UPLOAD_MAX_IMAGES_PER_UPLOAD: number;
+
+    @IsNotEmpty()
+    @IsNumber()
+    @Min(1)
+    @Max(10_000_000)
+    VALIDATION_UPLOAD_MAX_VIEWS_MAX: number;
 }
 
 export const validate = (config: Record<string, unknown>) => {