feat(cps): 淘宝活动落地页图做活——每活动关联图,运营上传/选已有

- model: cps_activity.image_url + 迁移 cps_activity_image 回填存量淘宝活动为现有图
- admin: 新建淘宝活动必传图(上传 /upload-image 或选已有 /activity-images),存绝对 URL
- 落地页 cps_redirect: 按 link→activity 取图展示,缺图兜底默认图,img src 经 html.escape
- media: save_cps_image + to_abs_media_url(基于 CPS_REDIRECT_BASE,跨域 admin-web 可显示)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/admin/repositories/cps.py

@@ -137,14 +137,29 @@ def list_activities(
     return offset_paginate(db, stmt, (desc(CpsActivity.id),), limit=limit, cursor=cursor)
 
 
+def list_activity_images(db: Session) -> list[str]:
+    """已用过的活动落地页图(distinct 非空 image_url),供新建活动复用选择。"""
+    rows = (
+        db.execute(
+            select(CpsActivity.image_url)
+            .where(CpsActivity.image_url.is_not(None))
+            .distinct()
+        )
+        .scalars()
+        .all()
+    )
+    return [r for r in rows if r]
+
+
 def create_activity(
     db: Session, *, name: str, platform: str = "meituan", act_id: str | None = None,
     product_view_sign: str | None = None, payload: str | None = None,
-    remark: str | None = None, commit: bool = True,
+    image_url: str | None = None, remark: str | None = None, commit: bool = True,
 ) -> CpsActivity:
     activity = CpsActivity(
         name=name, platform=platform, act_id=act_id,
-        product_view_sign=product_view_sign, payload=payload, remark=remark,
+        product_view_sign=product_view_sign, payload=payload,
+        image_url=image_url, remark=remark,
     )
     db.add(activity)
     if commit: