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/routers/accounts.py

@@ -62,6 +62,7 @@ from ..services.account_value import (
     SUIT_BAIRIMENG,
     SUIT_MENGTU,
     is_high_value_expr,
+    is_suit_queried_expr,
     suit_owned_expr,
     suit_sort_rank_expr,
 )
@@ -159,22 +160,23 @@ def _filter_accounts_query(
     # 高价值套装筛选
     hv = _query_str(high_value_filter)
     if hv:
+        suit_queried = is_suit_queried_expr()
         bairimeng_expr = suit_owned_expr(Account.high_value_owned, SUIT_BAIRIMENG)
         mengtu_expr = suit_owned_expr(Account.high_value_owned, SUIT_MENGTU)
         if hv == "both_available":
             query = query.filter(
-                Account.overview_queried_at.isnot(None),
+                suit_queried,
                 ~bairimeng_expr,
                 ~mengtu_expr,
             )
         elif hv == "can_bairimeng":
             query = query.filter(
-                Account.overview_queried_at.isnot(None),
+                suit_queried,
                 ~bairimeng_expr,
             )
         elif hv == "can_mengtu":
             query = query.filter(
-                Account.overview_queried_at.isnot(None),
+                suit_queried,
                 ~mengtu_expr,
             )
         elif hv == "owned_bairimeng":
@@ -576,7 +578,7 @@ def list_accounts(
             # 一键查询得到的「已兑换过的高价值套装」（不是整份快照 ——
             # 列表带不起 1~2KB/账号 的 JSON）。兑换条数不在这里：
             # 上面的 exchange_count 已经是**官方事件**聚合的结果。
-            high_value_owned=acc.high_value_owned or [],
+            high_value_owned=acc.high_value_owned,
             # 「有没有查过」靠它判断 —— 否则"查过但没兑换"和"没查过"都是空，分不开
             overview_queried_at=acc.overview_queried_at,
         )
@@ -640,32 +642,16 @@ def accounts_summary(
         Account.ck_check_status.in_(["invalid", "error"]),
     )
 
+    suit_queried = is_suit_queried_expr()
     hv_row = visible.with_entities(
-        func.count(
-            func.nullif(
-                Account.overview_queried_at.isnot(None)
-                & ~bairimeng_expr
-                & ~mengtu_expr,
-                False,
-            )
-        ),
-        func.count(
-            func.nullif(
-                Account.overview_queried_at.isnot(None) & ~bairimeng_expr,
-                False,
-            )
-        ),
-        func.count(
-            func.nullif(
-                Account.overview_queried_at.isnot(None) & ~mengtu_expr,
-                False,
-            )
-        ),
-        func.count(func.nullif(Account.overview_queried_at.is_(None), False)),
-        func.count(func.nullif(Account.points >= 300, False)),
-        func.count(func.nullif(Account.gold_balance > 0, False)),
-        func.count(func.nullif(Account.elite_opened.is_(True), False)),
-        func.count(func.nullif(high_value_broken_expr, False)),
+        func.count(case((and_(suit_queried, ~bairimeng_expr, ~mengtu_expr), 1))),
+        func.count(case((and_(suit_queried, ~bairimeng_expr), 1))),
+        func.count(case((and_(suit_queried, ~mengtu_expr), 1))),
+        func.count(case((~suit_queried, 1))),
+        func.count(case((Account.points >= 300, 1))),
+        func.count(case((Account.gold_balance > 0, 1))),
+        func.count(case((Account.elite_opened.is_(True), 1))),
+        func.count(case((high_value_broken_expr, 1))),
     ).first()
     high_value_summary = {
         "both_available": int(hv_row[0] or 0) if hv_row else 0,
@@ -1392,7 +1378,7 @@ def account_overview(
         "points_expire_at": acc.points_expire_at,
         "overview_snapshot": acc.overview_snapshot,
         "overview_queried_at": acc.overview_queried_at,
-        "high_value_owned": acc.high_value_owned or [],
+        "high_value_owned": acc.high_value_owned,
         "elite_opened": acc.elite_opened,
         "elite_expire_time": acc.elite_expire_time,
         "esports_expire_time": acc.esports_expire_time,