feat(cps): 后端接入淘宝/京东多平台(payload + 群多平台 + 复制统计 + 迁移)

- model: cps_group.platforms 多选 / cps_activity.payload(淘口令/京东链接)
  / cps_link.sid 可空 + 复制统计
- admin API: 群与活动平台多选、批量生成落地页短链 referral-links、对账字段可空
- 落地页 cps_redirect: 淘宝展示淘口令(记 copy 事件) / 京东 302 / 美团原逻辑
- 迁移 cps_v2_platforms: 加 platforms/payload/event_type 列, sid 放宽可空(含 downgrade)

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

app/models/cps_activity.py

@@ -8,7 +8,7 @@ from __future__ import annotations
 
 from datetime import datetime
 
-from sqlalchemy import DateTime, Integer, String, func
+from sqlalchemy import DateTime, Integer, String, Text, func
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.db.base import Base
@@ -24,6 +24,8 @@ class CpsActivity(Base):
     act_id: Mapped[str | None] = mapped_column(String(64), nullable=True)
     # 美团商品券 productViewSign(与 act_id 二选一转链;多数活动用 act_id)。
     product_view_sign: Mapped[str | None] = mapped_column(String(128), nullable=True)
+    # 淘宝:整段淘口令文本(落地页原样复制);京东:推广链接(落地页 302 跳)。美团不用这个(用 act_id)。
+    payload: Mapped[str | None] = mapped_column(Text, nullable=True)
     status: Mapped[str] = mapped_column(String(20), nullable=False, default="active")  # active | archived
     remark: Mapped[str | None] = mapped_column(String(256), nullable=True)
     created_at: Mapped[datetime] = mapped_column(

app/models/cps_group.py

@@ -7,7 +7,8 @@ from __future__ import annotations
 
 from datetime import datetime
 
-from sqlalchemy import DateTime, Integer, String, func
+from sqlalchemy import JSON, DateTime, Integer, String, func
+from sqlalchemy.dialects.postgresql import JSONB
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.db.base import Base
@@ -17,9 +18,13 @@ class CpsGroup(Base):
     __tablename__ = "cps_group"
 
     id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
-    # 每群唯一的渠道标识,建群时分配(留空则自动生成 g<id>)。字母+数字,≤64。
-    sid: Mapped[str] = mapped_column(String(64), unique=True, index=True, nullable=False)
+    # 渠道标识。仅美团需要(sid 追踪);纯淘宝/京东群无 sid(那俩不支持)。含美团时建群分配。
+    sid: Mapped[str | None] = mapped_column(String(64), unique=True, index=True, nullable=True)
     name: Mapped[str] = mapped_column(String(128), nullable=False)
+    # 该群发哪些平台的券(多选): ["meituan","taobao","jd"]。含 meituan 才需要 sid。
+    platforms: Mapped[list] = mapped_column(
+        JSON().with_variant(JSONB(), "postgresql"), nullable=False, default=list
+    )
     # 群人数,运营填,作转化率分母(可空)。
     member_count: Mapped[int | None] = mapped_column(Integer, nullable=True)
     status: Mapped[str] = mapped_column(String(20), nullable=False, default="active")  # active | archived

app/models/cps_link.py

@@ -23,10 +23,11 @@ class CpsLink(Base):
     code: Mapped[str] = mapped_column(String(16), unique=True, index=True, nullable=False)
     group_id: Mapped[int] = mapped_column(Integer, index=True, nullable=False)
     activity_id: Mapped[int] = mapped_column(Integer, index=True, nullable=False)
-    sid: Mapped[str] = mapped_column(String(64), index=True, nullable=False)
+    # 仅美团 link 有 sid(渠道追踪);淘宝/京东无 sid。
+    sid: Mapped[str | None] = mapped_column(String(64), index=True, nullable=True)
     platform: Mapped[str] = mapped_column(String(20), nullable=False, default="meituan")
-    # 302 跳转目标(美团短链,微信内可打开并唤起 App)。
-    target_url: Mapped[str] = mapped_column(String(1024), nullable=False)
+    # 跳转/落地目标: 美团短链 / 京东链接(302 跳) / 淘宝整段淘口令文本(H5 落地页复制)。
+    target_url: Mapped[str] = mapped_column(String(2048), nullable=False)
     created_at: Mapped[datetime] = mapped_column(
         DateTime(timezone=True), server_default=func.now(), nullable=False
     )
@@ -41,7 +42,11 @@ class CpsClick(Base):
     id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
     link_id: Mapped[int] = mapped_column(Integer, index=True, nullable=False)
     group_id: Mapped[int] = mapped_column(Integer, index=True, nullable=False)  # 冗余,按群聚合快
-    sid: Mapped[str] = mapped_column(String(64), index=True, nullable=False)    # 冗余
+    sid: Mapped[str | None] = mapped_column(String(64), index=True, nullable=True)  # 冗余(淘宝/京东无)
+    # 事件类型: visit(进落地页/被跳转) | copy(淘宝落地页点了"复制口令")
+    event_type: Mapped[str] = mapped_column(
+        String(16), nullable=False, default="visit", server_default="visit"
+    )
     ip: Mapped[str | None] = mapped_column(String(64), nullable=True)
     ua: Mapped[str | None] = mapped_column(String(512), nullable=True)
     clicked_at: Mapped[datetime] = mapped_column(