fix(overview): 锁定核心高价值套装并修复未查询空值误判

- 高价值套装精确匹配「套装-兔兔白日梦」与「套装-狂战萌兔」，排除头盔/背包/手榴弹散件干扰
- 增加 is_suit_queried_expr，未查询或 NULL 账号严禁误判为双套均可兑换
- 修复前后端序列化空值保持，完善列表与详情页准入状态和判定依据展示
- 新增头盔排除与 NULL 统计防错回归单测，全量通过 689 个用例

web/backend/services/account_value.py

@@ -42,14 +42,28 @@ def suit_owned_expr(column, text: str):
     )
 
 
+def is_suit_queried_expr():
+    """判断账号是否有效完成过高价值套装查询。
+
+    必须同时满足：
+    1. 有查询时间 overview_queried_at
+    2. high_value_owned 必须是有效 JSON 数组（排除 SQL NULL 与 JSON NULL）
+    """
+    return and_(
+        Account.overview_queried_at.isnot(None),
+        Account.high_value_owned.isnot(None),
+        cast(Account.high_value_owned, String).like("[%"),
+    )
+
+
 def value_tier_expr():
     """1–5 档。没查过、也没有任何资产信号时落在第 5 档。"""
-    queried = Account.overview_queried_at.isnot(None)
+    hv_queried = is_suit_queried_expr()
     owns_bairimeng = suit_owned_expr(Account.high_value_owned, SUIT_BAIRIMENG)
     owns_mengtu = suit_owned_expr(Account.high_value_owned, SUIT_MENGTU)
-    both_available = and_(queried, ~owns_bairimeng, ~owns_mengtu)
+    both_available = and_(hv_queried, ~owns_bairimeng, ~owns_mengtu)
     one_available = and_(
-        queried,
+        hv_queried,
         or_(
             and_(~owns_bairimeng, owns_mengtu),
             and_(owns_bairimeng, ~owns_mengtu),
@@ -59,7 +73,7 @@ def value_tier_expr():
         (both_available, 1),
         (or_(one_available, Account.points >= HIGH_VALUE_POINTS), 2),
         (or_(Account.gold_balance > 0, Account.elite_opened.is_(True)), 3),
-        (queried, 4),
+        (Account.overview_queried_at.isnot(None), 4),
         else_=5,
     )
 
@@ -79,18 +93,18 @@ def suit_sort_rank_expr():
 
     不掺积分、鱼翅。那是巡检分档的事，点这一列的人是在排套装。
     """
-    queried = Account.overview_queried_at.isnot(None)
+    hv_queried = is_suit_queried_expr()
     owns_bairimeng = suit_owned_expr(Account.high_value_owned, SUIT_BAIRIMENG)
     owns_mengtu = suit_owned_expr(Account.high_value_owned, SUIT_MENGTU)
-    both_available = and_(queried, ~owns_bairimeng, ~owns_mengtu)
+    both_available = and_(hv_queried, ~owns_bairimeng, ~owns_mengtu)
     one_available = and_(
-        queried,
+        hv_queried,
         or_(
             and_(~owns_bairimeng, owns_mengtu),
             and_(owns_bairimeng, ~owns_mengtu),
         ),
     )
-    both_owned = and_(queried, owns_bairimeng, owns_mengtu)
+    both_owned = and_(hv_queried, owns_bairimeng, owns_mengtu)
     return case(
         (both_available, 0),
         (one_available, 1),