总资产修正+购车图标联动

Fix1: 总资产错误 — HK市价被当人民币算
  portfolio.json已有正确 total_assets（含港币→人民币换算），
  改为直接读取该字段，不再手动累加持仓市值
  原代码用 h.get('currency')=='HKD' 判断但strategy_lifecycle
  格式不保存currency字段 → 所有HK持仓被当CNY计算 → 总资产多出6.8万

Fix2: 换仓推荐时显示🛒非⚠️
  原来用 lots==0 判断→永远⚠️，换仓推荐可让操作变为可行
  改为 lots>0 OR swap_text 时用 🛒（可操作）

data/portfolio.json

@@ -26,7 +26,8 @@
         "action_note": "⚠️盈亏比偏低(1:0.9)，不建议加仓",
         "timing_signal": "持有"
       },
-      "price": 794.1
+      "price": 794.5,
+      "change_pct": 5.23
     },
     {
       "code": "01478",
@@ -83,7 +84,7 @@
         "action_note": "⚠️盈亏比偏低(1:1.3)，不建议加仓",
         "timing_signal": "持有"
       },
-      "price": 10.48
+      "price": 10.45
     },
     {
       "code": "601899",
@@ -111,7 +112,8 @@
         "action_note": "深套持有",
         "timing_signal": "持有"
       },
-      "price": 27.5
+      "price": 27.68,
+      "change_pct": -0.25
     },
     {
       "code": "688639",
@@ -139,7 +141,7 @@
         "action_note": "⚠️盈亏比偏低(1:1.1)，不建议加仓",
         "timing_signal": "持有"
       },
-      "price": 21.44
+      "price": 21.43
     },
     {
       "code": "09988",
@@ -196,7 +198,8 @@
         "action_note": "",
         "timing_signal": "持有"
       },
-      "price": 116.94
+      "price": 115.9,
+      "change_pct": 9.02
     },
     {
       "code": "688981",
@@ -224,7 +227,8 @@
         "action_note": "",
         "timing_signal": "持有"
       },
-      "price": 154.23
+      "price": 153.36,
+      "change_pct": 8.23
     },
     {
       "code": "01888",
@@ -339,7 +343,8 @@
         "action_note": "⚠️盈亏比偏低(1:0.8)，不建议加仓",
         "timing_signal": "弱势持有"
       },
-      "price": 394.78
+      "price": 395.84,
+      "change_pct": 0.85
     },
     {
       "code": "01211",
@@ -483,7 +488,8 @@
         "action_note": "⚠️盈亏比偏低(1:1.1)，不建议加仓",
         "timing_signal": "弱势持有"
       },
-      "price": 37.04
+      "price": 37.01,
+      "change_pct": -1.04
     },
     {
       "code": "300548",
@@ -511,7 +517,8 @@
         "action_note": "短炒强趋势持",
         "timing_signal": "持有"
       },
-      "price": 278.12
+      "price": 278.58,
+      "change_pct": -2.6
     },
     {
       "code": "02318",
@@ -568,7 +575,7 @@
         "action_note": "深套持有",
         "timing_signal": "持有"
       },
-      "price": 16.13
+      "price": 16.15
     },
     {
       "code": "000700",
@@ -596,7 +603,8 @@
         "action_note": "",
         "timing_signal": "持有"
       },
-      "price": 14.64
+      "price": 14.54,
+      "change_pct": -2.94
     },
     {
       "code": "518880",
@@ -624,7 +632,8 @@
         "action_note": "深套持有",
         "timing_signal": "持有"
       },
-      "price": 8.44
+      "price": 8.45,
+      "change_pct": -0.98
     },
     {
       "code": "01088",
@@ -709,7 +718,8 @@
         "action_note": "⚠️盈亏比偏低(1:1.2)，不建议加仓",
         "timing_signal": "持有"
       },
-      "price": 22.87
+      "price": 22.9,
+      "change_pct": -3.09
     }
   ],
   "cash": 20230.1,