Add OTP-first signup and product catalog PDF uploads.

Signup verifies phone before password; existing Meshkee accounts keep their password. Products can attach an optional PDF catalog (max 2MB) via Pars Pack media.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/products/dto/product.dto.ts

@@ -104,6 +104,11 @@ export class CreateProductDto {
   @IsString()
   featuredMediaId?: string;
 
+  /** Optional PDF catalog file (media id; application/pdf, max 2MB). */
+  @IsOptional()
+  @IsString()
+  catalogMediaId?: string;
+
   @IsOptional()
   @IsArray()
   @IsString({ each: true })
@@ -165,6 +170,11 @@ export class UpdateProductDto {
   @IsString()
   featuredMediaId?: string | null;
 
+  /** Optional PDF catalog file (media id). Pass null to clear. */
+  @IsOptional()
+  @IsString()
+  catalogMediaId?: string | null;
+
   @IsOptional()
   @IsArray()
   @IsString({ each: true })