feat: configure and display public seller descriptions

packages/contracts/public-listing.js

@@ -17,6 +17,7 @@ export function toPublicListingDto(listing) {
     status: listing.status,
     notes: listing.notes ?? null,
     images: listing.images ?? [],
+    sellerDescription: listing.sellerDescription ?? null,
     sellerDisplayName: listing.sellerDisplayName ?? null,
     sellerContactEmail: listing.sellerContactEmail ?? null,
     sellerContactPhone: listing.sellerContactPhone ?? null,

packages/contracts/public-product.js

@@ -15,6 +15,7 @@ export function toPublicProductDto(product) {
     eventName: product.eventName ?? null,
     releaseYear: product.releaseYear ?? null,
     tags: product.tags ?? [],
+    sellerDescription: product.sellerDescription ?? null,
     sellerDisplayName: product.sellerDisplayName ?? null,
     sellerContactEmail: product.sellerContactEmail ?? null,
     sellerContactPhone: product.sellerContactPhone ?? null,

packages/validation/settings.js

@@ -2,6 +2,7 @@ import { z } from 'zod';
 
 export const sellerSettingsSchema = z.object({
   general: z.object({
+    publicDescription: z.string().trim().max(2000).optional(),
     publicContactEmail: z.string().trim().email().optional(),
     publicContactPhone: z.string().trim().max(50).optional(),
   }).strict().optional(),