feat(web): show cumulative fan range and limit recent records

tests/test_web_queries.py

@@ -213,6 +213,19 @@ def test_fans_candidates_system_and_export():
             wide = q.fans(days=30)
             assert wide["dates"] == list(DATES)
 
+            # “最近记录”只返回最近 14 天，早于窗口的记录不进入表格
+            db.write(lambda conn: conn.execute(
+                "INSERT OR REPLACE INTO up_stat"
+                "(stat_date, mid, follower, following, captured_at, ok) "
+                "VALUES (?, ?, ?, NULL, 1, 1)",
+                ("2026-10-01", 37754047, 900),
+            ))
+            recent = q.fans(days=90)
+            assert recent["recent_days"] == 14
+            assert [point["stat_date"] for point in recent["recent_points"]] == list(DATES)
+            one_day = q.fans(days=90, recent_days=1)
+            assert [point["stat_date"] for point in one_day["recent_points"]] == [DATES[-1]]
+
             # 缺失前一天时不能把跨多天的变化标成“日增”
             db.write(lambda conn: conn.execute(
                 "DELETE FROM up_stat WHERE mid=37754047 AND stat_date=?",