Add partnership request API with media uploads and admin listing.

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

prisma/schema.prisma

@@ -45,6 +45,13 @@ enum SmsOtpPurpose {
   storeRegister
 }
 
+enum PartnershipRequestStatus {
+  pending
+  reviewed
+  accepted
+  rejected
+}
+
 model User {
   id           String   @id @default(cuid())
   firstName    String
@@ -61,10 +68,11 @@ model User {
   createdAt    DateTime @default(now())
   updatedAt    DateTime @updatedAt
 
-  refreshTokens RefreshToken[]
-  addresses     UserAddress[]
-  ownedStore    Store?
-  orders        Order[]        @relation("CustomerOrders")
+  refreshTokens        RefreshToken[]
+  addresses            UserAddress[]
+  ownedStore           Store?
+  orders               Order[]               @relation("CustomerOrders")
+  partnershipRequests  PartnershipRequest[]
 
   @@index([role])
   @@index([disabled])
@@ -324,6 +332,32 @@ model OrderStoreFulfillment {
   @@index([status])
 }
 
+/// Producer / seller partnership applications from the storefront.
+model PartnershipRequest {
+  id              String                    @id @default(cuid())
+  userId          String
+  user            User                      @relation(fields: [userId], references: [id], onDelete: Cascade)
+  businessNameFa  String
+  businessNameEn  String                    @default("")
+  categoryIds     Int[]
+  description     String
+  imageUrls       String[]
+  cellNumber      String
+  landline        String?
+  instagram       String?
+  city            String
+  province        String
+  address         String
+  postalCode      String
+  status          PartnershipRequestStatus  @default(pending)
+  createdAt       DateTime                  @default(now())
+  updatedAt       DateTime                  @updatedAt
+
+  @@index([userId])
+  @@index([status])
+  @@index([createdAt])
+}
+
 /// Homepage / storefront image slots (hero slides, banners, category thumbs, …)
 model WebsiteSlotItem {
   id        String   @id @default(cuid())