feat(admin): 首页门面数字保底/护栏 + 轮播种子真实化与批量 + 比价记录索引

- ops_stat: 真实值 offset→保底(max);初始基数过只增不减护栏
- ops_marquee: 脱敏名手机尾号+中文昵称混合;金额长尾;时间随机抖动;真实+种子不足兜底补满;真实记录查询 ~30s 缓存
- comparison_record: 复合索引 (status, created_at) + 迁移(PG CONCURRENTLY);修复 alembic 多 head(merge 改挂 onboarding_completion)
- 轮播种子批量删除/启用接口 + ids 上限;docs 同步
- 附带并行会话 WIP:admin users / wallet

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

app/models/ops_stat_config.py

@@ -53,7 +53,8 @@ class OpsStatConfig(Base):
     random_kind: Mapped[str] = mapped_column(String(8), nullable=False, default="mult")
     random_step_min: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
     random_step_max: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
-    # real 模式基数偏移(基础单位;total_saved 为分):展示值 = 真实值 + 偏移(冷启动期既真实又体面)
+    # real 模式保底值(基础单位;total_saved 为分):展示值 = max(真实值, 保底值)。冷启动显示保底撑
+    # 场面,真实值涨过保底后显示纯真实、零差距。列名沿用 real_offset(语义已从"偏移"改为"保底")
     real_offset: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
     # 门面数字默认「只增不减」;运营明确要下调时才开此开关(real/manual 刷新都受护栏约束)
     allow_decrease: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)