fix(expiry): 已过期资产不再从到期统计中消失，总览页改为到期日历

get_expiring/get_overview 去掉 expiry_date>=today 下界（仅排除已注销）并新增 overdue_count；renewal_service 续费提醒纳入已过期、文案区分已过期N天/今天到期/N天后；dashboard 用到期日历逐条显示具体到期日与倒计时；api.js 新增 Fmt.countdownText 统一文案。

app/services/renewal_service.py

@@ -16,8 +16,9 @@ _SKIP_STATUS = {AssetStatus.CANCELLED}
 
 
 def get_expiring_assets(session: Session, threshold_days: int) -> list:
-    """返回 threshold_days 天内到期的资产列表 [(asset, days), ...]，按剩余天数升序
+    """返回 threshold_days 天内到期（含已过期未处理）的资产列表 [(asset, days), ...]，按剩余天数升序
 
+    到期日不设下界：过了续费日仍未注销/续费的资产，提醒不能就此消失。
     性能优化：日期范围与状态过滤均下推到 SQL 层。
     """
     today = date.today()
@@ -25,7 +26,6 @@ def get_expiring_assets(session: Session, threshold_days: int) -> list:
     assets = session.exec(
         select(Asset).where(
             Asset.expiry_date.is_not(None),
-            Asset.expiry_date >= today,
             Asset.expiry_date <= deadline,
             Asset.status.notin_(_SKIP_STATUS),
         )
@@ -39,9 +39,19 @@ def build_renewal_message(expiring: list, threshold_days: int) -> str:
     """生成续费提醒消息（纯文本，兼容 Telegram/邮件）"""
     if not expiring:
         return ""
-    lines = [f"⏰ 资产续费提醒（{threshold_days} 天内到期，共 {len(expiring)} 项）", ""]
+    overdue = sum(1 for _, d in expiring if d < 0)
+    if overdue:
+        head = f"⏰ 资产续费提醒（已过期 {overdue} 项 + {threshold_days} 天内到期 {len(expiring) - overdue} 项）"
+    else:
+        head = f"⏰ 资产续费提醒（{threshold_days} 天内到期，共 {len(expiring)} 项）"
+    lines = [head, ""]
     for asset, days in expiring:
-        tag = "（已过期）" if days == 0 else f"（{days} 天后）"
+        if days < 0:
+            tag = f"（已过期 {-days} 天）"
+        elif days == 0:
+            tag = "（今天到期）"
+        else:
+            tag = f"（{days} 天后）"
         lines.append(f"• {asset.name} [{asset.provider}] {tag} 到期 {asset.expiry_date}")
     return "\n".join(lines)