00700 腾讯成本修复: 443.13 HKD

holdings/holding_strategies 表中 00700 的 cost 字段 =0，
从旧备份 data 追溯确认成本为 443.13 HKD，已修正。
portfolio.json 同步刷新。
验证: 00700 431.2 HKD 浮亏-2.7%（非-17.7%的币种错配数据）

data/portfolio.json

@@ -136,7 +136,7 @@
       "code": "00700",
       "name": "腾讯",
       "shares": 100,
-      "cost": 0.0,
+      "cost": 443.13,
       "price": 431.2,
       "market_value": 37437.0,
       "change_pct": 0.23,
@@ -229,13 +229,12 @@
       "_currency": "HKD"
     }
   ],
-  "total_assets": 953295.26,
-  "total_mv": 821173.33,
-  "stock_value": 821173.33,
+  "total_assets": 952877.07,
+  "total_mv": 820755.14,
+  "stock_value": 820755.14,
   "cash": 132121.93,
   "frozen_cash": 0,
-  "position_pct": 86.14,
+  "position_pct": 86.13,
   "currency": "CNY",
-  "updated_at": "2026-07-03 23:28:11",
-  "_source": "db_sync_final"
+  "updated_at": "2026-07-04 09:51"
 }