feat(ops): v4.0.2 活动图模板、合伙人选择持久化与用户管理主图

HQ 上传底图与码栏；合伙人单选写入 partner_account.activity_poster_id，用户管理下次登录仍显示同一张图。

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

server/dukang-api/prisma/schema.prisma

@@ -44,6 +44,7 @@ enum ResourceBizType {
   SIGN_PHOTO
   VIDEO
   REDEEM_PENDING_PHOTO
+  ACTIVITY_POSTER
 }
 
 enum RedeemPendingStatus {
@@ -1204,6 +1205,7 @@ model PartnerAccount {
   managedWarehouseId   BigInt?              @unique @map("managed_warehouse_id") @db.UnsignedBigInt
   assocQrcodeId        String?              @unique @map("assoc_qrcode_id") @db.VarChar(64)
   assocQrcodeResourceId BigInt?             @map("assoc_qrcode_resource_id") @db.UnsignedBigInt
+  activityPosterId     BigInt?              @map("activity_poster_id") @db.UnsignedBigInt
   /// 测试合伙人账号
   isTest               Boolean              @default(false) @map("is_test")
   createdAt            DateTime             @default(now()) @map("created_at") @db.DateTime(3)
@@ -1219,6 +1221,7 @@ model PartnerAccount {
   assocUsers       User[]               @relation("UserPartnerAssoc")
   userNotes        PartnerUserNote[]
   assocQrcodeResource CommonResource?   @relation("PartnerAssocQrcode", fields: [assocQrcodeResourceId], references: [id], onDelete: SetNull)
+  activityPoster      ActivityPoster?   @relation(fields: [activityPosterId], references: [id], onDelete: SetNull)
 
   @@index([cityId, scopeType])
   @@index([cityId, isPrimary])
@@ -1226,6 +1229,7 @@ model PartnerAccount {
   @@index([wxOpenId])
   @@index([contactPhone])
   @@index([isTest])
+  @@index([activityPosterId])
   @@map("partner_account")
 }
 
@@ -1246,6 +1250,26 @@ model PartnerUserNote {
   @@map("partner_user_note")
 }
 
+/// HQ 活动图模板：底图 + 方形码栏（相对百分比）+ 文案
+model ActivityPoster {
+  id        BigInt   @id @default(autoincrement()) @db.UnsignedBigInt
+  title     String   @db.VarChar(128)
+  copyText  String   @map("copy_text") @db.Text
+  imageUrl  String   @map("image_url") @db.VarChar(512)
+  qrXPct    Decimal  @map("qr_x_pct") @db.Decimal(5, 2)
+  qrYPct    Decimal  @map("qr_y_pct") @db.Decimal(5, 2)
+  qrSizePct Decimal  @map("qr_size_pct") @db.Decimal(5, 2)
+  sortOrder Int      @default(0) @map("sort_order")
+  status    String   @default("ACTIVE") @db.VarChar(16)
+  createdAt DateTime @default(now()) @map("created_at") @db.DateTime(3)
+  updatedAt DateTime @updatedAt @map("updated_at") @db.DateTime(3)
+
+  selectedByPartners PartnerAccount[]
+
+  @@index([status, sortOrder])
+  @@map("activity_poster")
+}
+
 model PartnerBill {
   id                BigInt            @id @default(autoincrement()) @db.UnsignedBigInt
   billNo            String            @unique @map("bill_no") @db.VarChar(32)