feat(platform): 首页轮播 feed 接入真实数据 + 三统计配置增强

轮播 feed(marquee_seed,全新):
- 新增 marquee_seed 表 + admin CRUD/批量生成/预览;真实比价记录(success 且 0<省额≤300元、按 user 去重)优先,种子兜底混播
- 种子为「生成规则」:用户名可空(空则按脱敏格式随机合成、避开同屏撞名),金额改 [min,max] 区间随机,feed 公平随机抽取(不看 sort_order)
- 新增 GET /api/v1/platform/savings-feed(无鉴权);展示时间统一刷新为相对当前的最近时刻

三统计配置(platform_stat_display)增强:
- 自增长新增「绝对增量」方式(random_kind=add,每周期 +[step_min,step_max])
- 真实值模式加基数偏移(real_offset,展示=真实+偏移)
- 只增不减护栏(allow_decrease 默认关,real/manual 不回退防门面缩水)
- 累计节省 real 口径只计 0<单条≤300元防虚高;倍率上限 5.0→1.5;PATCH 支持 apply_now 立即更新

迁移:marquee_seed_table / marquee_seed_range / platform_stat_growth_offset(均可逆,已验证)
文档:API/DB 对应文档同步更新

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/admin/main.py

@@ -20,6 +20,7 @@ from app.admin.routers.config import router as config_router
 from app.admin.routers.dashboard import router as dashboard_router
 from app.admin.routers.dashboard_display import router as dashboard_display_router
 from app.admin.routers.feedback import router as feedback_router
+from app.admin.routers.marquee_seed import router as marquee_seed_router
 from app.admin.routers.users import router as users_router
 from app.admin.routers.wallet import router as wallet_router
 from app.admin.routers.withdraw import router as withdraw_router
@@ -75,6 +76,7 @@ def health() -> dict[str, str]:
 admin_app.include_router(auth_router)
 admin_app.include_router(dashboard_router)
 admin_app.include_router(dashboard_display_router)
+admin_app.include_router(marquee_seed_router)
 admin_app.include_router(users_router)
 admin_app.include_router(wallet_router)
 admin_app.include_router(withdraw_router)

app/admin/routers/dashboard_display.py

@@ -50,6 +50,11 @@ def update_display(
             random_mult_max=body.random_mult_max,
             random_tick_seconds=body.random_tick_seconds,
             random_anchor_minutes=body.random_anchor_minutes,
+            random_kind=body.random_kind,
+            random_step_min=body.random_step_min,
+            random_step_max=body.random_step_max,
+            real_offset=body.real_offset,
+            allow_decrease=body.allow_decrease,
             random_initial=body.random_initial,
             apply_now=body.apply_now,
             admin_id=admin.id,

app/admin/routers/marquee_seed.py

@@ -0,0 +1,160 @@
+"""admin 首页轮播种子管理:列出 / 新增 / 改 / 删 / 批量生成 / 预览(带审计)。
+
+种子用于首页轮播「真实+种子混播」的兜底(见 app/repositories/marquee.py)。
+权限:operator 可改,super 恒可;预览为只读(任意已登录 admin)。
+"""
+from __future__ import annotations
+
+from typing import Annotated
+
+from fastapi import APIRouter, Depends, HTTPException, Query, Request
+
+from app.admin.audit import write_audit
+from app.admin.deps import AdminDb, get_client_ip, get_current_admin, require_role
+from app.admin.schemas.marquee_seed import (
+    MarqueeSeedBulkCreate,
+    MarqueeSeedCreate,
+    MarqueeSeedOut,
+    MarqueeSeedUpdate,
+    SavingsFeedPreviewOut,
+)
+from app.models.admin import AdminUser
+from app.models.marquee_seed import MarqueeSeed
+from app.repositories import marquee
+
+router = APIRouter(
+    prefix="/admin/api/marquee-seeds",
+    tags=["admin-marquee-seeds"],
+    dependencies=[Depends(get_current_admin)],
+)
+
+
+def _out(seed: MarqueeSeed) -> MarqueeSeedOut:
+    return MarqueeSeedOut(
+        id=seed.id,
+        masked_user=seed.masked_user,
+        min_cents=seed.min_cents,
+        max_cents=seed.max_cents,
+        enabled=seed.enabled,
+        sort_order=seed.sort_order,
+        created_at=seed.created_at.isoformat() if seed.created_at else None,
+    )
+
+
+@router.get("", response_model=list[MarqueeSeedOut], summary="轮播种子列表")
+def list_seeds(db: AdminDb) -> list[MarqueeSeedOut]:
+    return [_out(s) for s in marquee.list_seeds(db)]
+
+
+@router.get("/preview", response_model=SavingsFeedPreviewOut, summary="预览实际混播 feed")
+def preview_feed(
+    db: AdminDb,
+    limit: Annotated[int, Query(ge=1, le=30)] = 8,
+) -> SavingsFeedPreviewOut:
+    """返回客户端实际会看到的 feed(真实记录会插队、种子随机抽取/金额随机/名字合成),供运营对效果。"""
+    return SavingsFeedPreviewOut(items=marquee.get_feed(db, limit=limit))
+
+
+@router.post("", response_model=MarqueeSeedOut, summary="新增轮播种子(带审计)")
+def create_seed(
+    body: MarqueeSeedCreate,
+    request: Request,
+    admin: Annotated[AdminUser, Depends(require_role("operator"))],
+    db: AdminDb,
+) -> MarqueeSeedOut:
+    try:
+        seed = marquee.create_seed(
+            db,
+            masked_user=body.masked_user,
+            min_cents=body.min_cents,
+            max_cents=body.max_cents,
+            enabled=body.enabled,
+            sort_order=body.sort_order,
+            commit=False,
+        )
+    except ValueError as e:
+        raise HTTPException(status_code=400, detail=str(e)) from e
+    write_audit(
+        db, admin, action="marquee_seed.create", target_type="marquee_seed",
+        target_id=None, detail=body.model_dump(), ip=get_client_ip(request), commit=False,
+    )
+    db.commit()
+    db.refresh(seed)
+    return _out(seed)
+
+
+@router.post("/bulk", response_model=list[MarqueeSeedOut], summary="批量生成种子(带审计)")
+def bulk_generate(
+    body: MarqueeSeedBulkCreate,
+    request: Request,
+    admin: Annotated[AdminUser, Depends(require_role("operator"))],
+    db: AdminDb,
+) -> list[MarqueeSeedOut]:
+    try:
+        seeds = marquee.bulk_generate(
+            db,
+            count=body.count,
+            min_cents=body.min_cents,
+            max_cents=body.max_cents,
+            enabled=body.enabled,
+            commit=False,
+        )
+    except ValueError as e:
+        raise HTTPException(status_code=400, detail=str(e)) from e
+    write_audit(
+        db, admin, action="marquee_seed.bulk_generate", target_type="marquee_seed",
+        target_id=None, detail=body.model_dump(), ip=get_client_ip(request), commit=False,
+    )
+    db.commit()
+    for s in seeds:
+        db.refresh(s)
+    return [_out(s) for s in seeds]
+
+
+@router.patch("/{seed_id}", response_model=MarqueeSeedOut, summary="改轮播种子(带审计)")
+def update_seed(
+    seed_id: int,
+    body: MarqueeSeedUpdate,
+    request: Request,
+    admin: Annotated[AdminUser, Depends(require_role("operator"))],
+    db: AdminDb,
+) -> MarqueeSeedOut:
+    try:
+        seed = marquee.update_seed(
+            db,
+            seed_id,
+            masked_user=body.masked_user,
+            min_cents=body.min_cents,
+            max_cents=body.max_cents,
+            enabled=body.enabled,
+            sort_order=body.sort_order,
+            commit=False,
+        )
+    except ValueError as e:
+        raise HTTPException(status_code=404 if "不存在" in str(e) else 400, detail=str(e)) from e
+    write_audit(
+        db, admin, action="marquee_seed.update", target_type="marquee_seed",
+        target_id=seed_id, detail=body.model_dump(exclude_none=True),
+        ip=get_client_ip(request), commit=False,
+    )
+    db.commit()
+    db.refresh(seed)
+    return _out(seed)
+
+
+@router.delete("/{seed_id}", summary="删轮播种子(带审计)")
+def delete_seed(
+    seed_id: int,
+    request: Request,
+    admin: Annotated[AdminUser, Depends(require_role("operator"))],
+    db: AdminDb,
+) -> dict:
+    ok = marquee.delete_seed(db, seed_id, commit=False)
+    if not ok:
+        raise HTTPException(status_code=404, detail="种子不存在")
+    write_audit(
+        db, admin, action="marquee_seed.delete", target_type="marquee_seed",
+        target_id=seed_id, detail=None, ip=get_client_ip(request), commit=False,
+    )
+    db.commit()
+    return {"deleted": True}

app/admin/schemas/dashboard_display.py

@@ -17,9 +17,14 @@ class PlatformStatItemOut(BaseModel):
     random_mult_max: int
     random_tick_seconds: int
     random_anchor_minutes: int
+    random_kind: str  # mult(×倍率) / add(+绝对增量)
+    random_step_min: int  # 绝对增量区间(基础单位;total_saved 为分)
+    random_step_max: int
+    real_offset: int  # 真实值模式基数偏移(基础单位)
+    allow_decrease: bool  # 是否允许展示值下降(默认 false = 只增不减)
     random_current: int | None = None
     random_last_tick_at: str | None = None
-    real_value: int  # 当前真实值(给运营对比参考)
+    real_value: int  # 当前真实值(纯真实、不含偏移;给运营对比参考)
     updated_at: str | None = None
 
 
@@ -32,7 +37,12 @@ class PlatformStatUpdateRequest(BaseModel):
     random_mult_max: int | None = None
     random_tick_seconds: int | None = None
     random_anchor_minutes: int | None = None
+    random_kind: str | None = None  # mult / add
+    random_step_min: int | None = None
+    random_step_max: int | None = None
+    real_offset: int | None = None
+    allow_decrease: bool | None = None
     # 切 random 时的初始基数;不传则用当前真实值播种
     random_initial: int | None = None
-    # 立即更新:不等更新钟点,保存后马上把展示值刷新一次(real 快照/manual 生效/random ×一档)
+    # 立即更新:不等更新钟点,保存后马上把展示值刷新一次(real 快照/manual 生效/random 走一档)
     apply_now: bool = False

app/admin/schemas/marquee_seed.py

@@ -0,0 +1,53 @@
+"""admin 首页轮播种子 schemas。金额单位:分(前端展示 ÷100 取元)。
+
+种子 = 生成规则:masked_user 可空(空→feed 随机合成名)、金额是 [min_cents, max_cents] 区间。
+"""
+from __future__ import annotations
+
+from pydantic import BaseModel
+
+
+class MarqueeSeedOut(BaseModel):
+    id: int
+    masked_user: str | None = None
+    min_cents: int
+    max_cents: int
+    enabled: bool
+    sort_order: int
+    created_at: str | None = None
+
+
+class MarqueeSeedCreate(BaseModel):
+    masked_user: str | None = None  # 空 / 不传 → feed 随机合成脱敏名
+    min_cents: int
+    max_cents: int
+    enabled: bool = True
+    sort_order: int = 0
+
+
+class MarqueeSeedUpdate(BaseModel):
+    # masked_user:不传=不改;传空串=清空(改回随机合成);传值=固定该名
+    masked_user: str | None = None
+    min_cents: int | None = None
+    max_cents: int | None = None
+    enabled: bool | None = None
+    sort_order: int | None = None
+
+
+class MarqueeSeedBulkCreate(BaseModel):
+    """批量生成 count 条自动合成名种子(冷启动铺量)。"""
+    count: int
+    min_cents: int
+    max_cents: int
+    enabled: bool = True
+
+
+class SavingsFeedPreviewItem(BaseModel):
+    masked_user: str
+    saved_amount_cents: int
+    time: str
+
+
+class SavingsFeedPreviewOut(BaseModel):
+    """运营预览:实际混播出来的 feed(真实记录会插队,与客户端一致)。"""
+    items: list[SavingsFeedPreviewItem]