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/migrate-activity-poster-v402.sql

@@ -0,0 +1,37 @@
+-- v4.0.2：活动图模板（底图 + 方形码栏 + 文案）
+
+ALTER TABLE `common_resource`
+  MODIFY COLUMN `biz_type` ENUM(
+    'COVER',
+    'ENV',
+    'CONTRACT',
+    'CAROUSEL',
+    'DETAIL',
+    'AVATAR',
+    'QRCODE',
+    'SIGN_PHOTO',
+    'VIDEO',
+    'REDEEM_PENDING_PHOTO',
+    'ACTIVITY_POSTER'
+  ) NOT NULL;
+
+CREATE TABLE IF NOT EXISTS `activity_poster` (
+  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
+  `title` VARCHAR(128) NOT NULL,
+  `copy_text` TEXT NOT NULL,
+  `image_url` VARCHAR(512) NOT NULL,
+  `qr_x_pct` DECIMAL(5,2) NOT NULL,
+  `qr_y_pct` DECIMAL(5,2) NOT NULL,
+  `qr_size_pct` DECIMAL(5,2) NOT NULL,
+  `sort_order` INT NOT NULL DEFAULT 0,
+  `status` VARCHAR(16) NOT NULL DEFAULT 'ACTIVE',
+  `created_at` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+  `updated_at` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
+  PRIMARY KEY (`id`),
+  KEY `idx_activity_poster_status_sort` (`status`, `sort_order`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='HQ 活动图模板';
+
+INSERT IGNORE INTO `hq_role_permission` (`admin_role`, `permission_key`)
+SELECT 'OPS', 'activity_posters'
+FROM DUAL
+WHERE EXISTS (SELECT 1 FROM `hq_role_permission` WHERE `admin_role` = 'OPS');