fix(home): server-owned growth window; expose days

Home omits growth_days; backend auto (or home_growth_days 1/7) picks
the window. Response includes days alongside growth_days. Growth榜 link
uses the returned days. Non-growth sorts treat omitted/auto as 7.

reaction_board/web/queries.py

@@ -699,7 +699,7 @@ class DashboardQueries:
         sort: str = "heat",
         within_days: int | None = None,
         year: int | None = None,
-        growth_days: int | str = 7,
+        growth_days: int | str = "auto",
         folder_id: int | None = None,
         q: str | None = None,
         page: int = 1,
@@ -734,7 +734,7 @@ class DashboardQueries:
         sort: str = "heat",
         within_days: int | None = None,
         year: int | None = None,
-        growth_days: int | str = 7,
+        growth_days: int | str = "auto",
         folder_id: int | None = None,
         q: str | None = None,
         page: int = 1,
@@ -742,24 +742,29 @@ class DashboardQueries:
     ) -> dict[str, Any]:
         if sort not in VIDEO_SORTS:
             raise ValueError(f"不支持的排序: {sort}")
+        # auto：仅增长类排序由服务端选窗（配置 home_growth_days；默认先 7 再降 1）。
+        # 首页应省略 growth_days，勿自行探查。其它排序把 auto 当作 7（兼容旧默认）。
         if growth_days == "auto":
-            preferred = self.config_store.get().analytics.home_growth_days
-            if preferred in (1, 7):
-                growth_days = int(preferred)
+            if sort in {"growth", "growth_rate"}:
+                preferred = self.config_store.get().analytics.home_growth_days
+                if preferred in (1, 7):
+                    growth_days = int(preferred)
+                else:
+                    trial = self._list_videos_uncached(
+                        sort=sort,
+                        within_days=within_days,
+                        year=year,
+                        growth_days=7,
+                        folder_id=folder_id,
+                        q=q,
+                        page=page,
+                        page_size=page_size,
+                    )
+                    if trial.get("available") and int(trial.get("total") or 0) > 0:
+                        return trial
+                    growth_days = 1
             else:
-                trial = self._list_videos_uncached(
-                    sort=sort,
-                    within_days=within_days,
-                    year=year,
-                    growth_days=7,
-                    folder_id=folder_id,
-                    q=q,
-                    page=page,
-                    page_size=page_size,
-                )
-                if trial.get("available") and int(trial.get("total") or 0) > 0:
-                    return trial
-                growth_days = 1
+                growth_days = 7
         growth_days = int(growth_days)
         if growth_days < 1 or growth_days > 365:
             raise ValueError("growth_days 必须在 1~365 之间")
@@ -942,6 +947,8 @@ class DashboardQueries:
                 "within_days": within_days,
                 "year": year,
                 "growth_days": growth_days,
+                # days：与 growth_days 同步；首页 auto 时为 1|7，供前端链接/展示
+                "days": growth_days,
                 "page": page,
                 "page_size": page_size,
                 "total": total,