refactor(profile,monitor): move height/weight from MonitorMetric to UserProfile

身高/体重对成人变化慢,作为 Profile 静态字段比每次录入 Indicator 更合适。

- MonitorMetric:6 case(从 8 减),删 .height / .weight
- UserProfile:加 weightKG: Double?(支持小数),加 bmi computed
- summaryLine 加体重段:'175cm · 68.5kg'(整数省小数)
- ProfileEditView basics 加 weight 行 + footer 显示 BMI + 分类(偏瘦/正常/超重/肥胖)
- IndicatorQuickSheet:删 .height 回写 Profile 的特殊逻辑
- UserProfileTests:+5 个(weight 字段、summaryLine 含 weight、BMI 计算)

兼容性:老 Indicator 里的 seriesKey 'weight' / 'height' 数据保留(SwiftData String?
不变),只是新录入路径走 Profile 不走 Indicator;Trends 仍能用 String seriesKey
查询历史(如果将来要展示老数据)。

测试:60 case pass / 0 fail / 0 warning。

康康/Features/Profile/ProfileEditView.swift

@@ -53,11 +53,28 @@ private struct ProfileEditForm: View {
     // MARK: - 基本
 
     private var basicsSection: some View {
-        Section("基本") {
+        Section {
             birthYearPicker
             sexPicker
             heightRow
+            weightRow
             bloodTypePicker
+        } header: {
+            Text("基本")
+        } footer: {
+            if let bmi = profile.bmi {
+                Text("BMI: \(String(format: "%.1f", bmi))  \(bmiLabel(bmi))")
+                    .font(.system(size: 11))
+            }
+        }
+    }
+
+    private func bmiLabel(_ bmi: Double) -> String {
+        switch bmi {
+        case ..<18.5:  return "(偏瘦)"
+        case ..<24:    return "(正常)"
+        case ..<28:    return "(超重)"
+        default:       return "(肥胖)"
         }
     }
 
@@ -97,6 +114,18 @@ private struct ProfileEditForm: View {
         }
     }
 
+    private var weightRow: some View {
+        HStack {
+            Text("体重")
+            Spacer()
+            TextField("kg", value: $profile.weightKG, format: .number.precision(.fractionLength(0...1)))
+                .keyboardType(.decimalPad)
+                .multilineTextAlignment(.trailing)
+                .frame(width: 80)
+            Text("kg").foregroundStyle(Tj.Palette.text3)
+        }
+    }
+
     private var bloodTypePicker: some View {
         Picker("血型", selection: $profile.bloodTypeRaw) {
             Text("不知道").tag("")