feat: 国际化(i18n) en/ja/ko + App 内语言切换

主体:多语言支持(简体中文源 + 英/日/韩)
- 基础设施:Localizable.xcstrings(String Catalog,sourceLanguage=zh-Hans)
  + pbxproj developmentRegion/knownRegions 注册 en/ja/ko
- 全部硬编码 Locale("zh_CN") → Locale.current;中文 dateFormat → Date.FormatStyle(跟随系统)
- UI 中文字面量统一为 String(appLoc:)(显式绑定所选语言 bundle+locale,即时切换)
  Text 字面量走环境 \.locale + Bundle 重定向
- 549 个 catalog key 全部 en/ja/ko 翻译完成(0 未翻译)
- App 内语言切换:我的 → 语言(LanguageManager + 即时生效,无需重启)
- 双用预设(症状/监测指标/慢病)本地化:static→computed 避免缓存

注:本提交为 WIP,一并打包了并行进行的功能模块
(HealthExport 健康导出、Security/Face ID 锁、DiaryAssist 日记 AI 辅助)
及 App 图标、CLAUDE.md、docs/scripts。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

康康/Features/Indicator/CustomMetricEditor.swift

@@ -21,8 +21,8 @@ enum CustomMetricNameConflict: Equatable {
     var warningText: String {
         switch self {
         case .none:                 return ""
-        case .builtin(let n):       return "「\(n)」是内置指标的名字 — 录入 grid 里会出现两个同名块"
-        case .existingCustom(let n):return "已经有一个叫「\(n)」的自定义指标"
+        case .builtin(let n):       return String(appLoc: "「\(n)」是内置指标的名字 — 录入 grid 里会出现两个同名块")
+        case .existingCustom(let n):return String(appLoc: "已经有一个叫「\(n)」的自定义指标")
         }
     }
 }
@@ -133,7 +133,7 @@ struct CustomMetricEditor: View {
 
     private var nameSection: some View {
         VStack(alignment: .leading, spacing: 8) {
-            sectionLabel("名称")
+            sectionLabel(String(appLoc: "名称"))
             TextField("例如:腰围 / 步数 / 睡眠时长", text: $name)
                 .padding(.horizontal, 14).padding(.vertical, 12)
                 .background(fieldBg)
@@ -161,7 +161,7 @@ struct CustomMetricEditor: View {
 
     private var unitSection: some View {
         VStack(alignment: .leading, spacing: 8) {
-            sectionLabel("单位(可选)")
+            sectionLabel(String(appLoc: "单位(可选)"))
             TextField("例如:cm / 步 / 小时", text: $unit)
                 .autocorrectionDisabled()
                 .padding(.horizontal, 14).padding(.vertical, 12)
@@ -172,16 +172,16 @@ struct CustomMetricEditor: View {
     private var rangeRow: some View {
         VStack(alignment: .leading, spacing: 8) {
             HStack {
-                sectionLabel("参考范围(可选)")
+                sectionLabel(String(appLoc: "参考范围(可选)"))
                 Spacer()
                 Text("用于自动判定 正常/偏高/偏低")
                     .font(.system(size: 10))
                     .foregroundStyle(Tj.Palette.text3)
             }
             HStack(spacing: 12) {
-                rangeField(label: "下限", value: $lower, placeholder: "70")
+                rangeField(label: String(appLoc: "下限"), value: $lower, placeholder: "70")
                 Text("—").foregroundStyle(Tj.Palette.text3)
-                rangeField(label: "上限", value: $upper, placeholder: "90")
+                rangeField(label: String(appLoc: "上限"), value: $upper, placeholder: "90")
             }
         }
     }
@@ -199,7 +199,7 @@ struct CustomMetricEditor: View {
 
     private var iconSection: some View {
         VStack(alignment: .leading, spacing: 8) {
-            sectionLabel("图标")
+            sectionLabel(String(appLoc: "图标"))
             LazyVGrid(columns: Array(repeating: GridItem(.flexible(), spacing: 8), count: 4),
                       spacing: 8) {
                 ForEach(customMetricIconChoices, id: \.self) { sf in