feat(i18n): 完成全量 UI 文本国际化，替换所有硬编码中文为 AppLocalizations 调用

- core/localization: 新增约 60 个翻译键（含参数化方法），中英双语覆盖
- shared/widgets: CommonDialog 默认参数国际化
- features/home: 完成页操作步骤指引、状态栏串口连接状态、程序列表状态标签
- features/programs: 表头状态列、表单验证提示、导入/模板操作反馈、删除确认（参数化）
- features/program_detail: 步骤列表/表单标题、删除确认、速度档位显示（参数化）
- features/device: run_state_provider 错误消息改为错误码
- features/settings: 升级页、密码面板、语言面板、U盘导入面板、串口配置面板全部替换

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

lib/features/home/pages/complete_page.dart

@@ -89,7 +89,7 @@ class CompletePage extends ConsumerWidget {
 
                     // 标题
                     Text(
-                      l10n?.runComplete ?? '程序运行完成',
+                      l10n?.programRunComplete ?? '程序运行完成',
                       style: TextStyle(
                         color: AppTheme.textPrimary,
                         fontSize: 24,
@@ -121,7 +121,7 @@ class CompletePage extends ConsumerWidget {
                     const SizedBox(height: 20),
 
                     // 操作示意图
-                    _buildOperationGuide(),
+                    _buildOperationGuide(context),
 
                     const SizedBox(height: 24),
 
@@ -167,7 +167,8 @@ class CompletePage extends ConsumerWidget {
   }
 
   /// 操作指引示意图
-  Widget _buildOperationGuide() {
+  Widget _buildOperationGuide(BuildContext context) {
+    final l10n = AppLocalizations.of(context);
     return Container(
       padding: const EdgeInsets.all(16),
       decoration: BoxDecoration(
@@ -178,7 +179,7 @@ class CompletePage extends ConsumerWidget {
       child: Column(
         children: [
           Text(
-            '操作步骤',
+            l10n?.operationSteps ?? '操作步骤',
             style: TextStyle(
               color: AppTheme.textPrimary,
               fontSize: 14,
@@ -189,10 +190,10 @@ class CompletePage extends ConsumerWidget {
           Row(
             mainAxisAlignment: MainAxisAlignment.spaceEvenly,
             children: [
-              _buildStepItem(1, '取出样本', Icons.science),
-              _buildStepItem(2, '滴入检测卡', Icons.water_drop),
-              _buildStepItem(3, '等待反应', Icons.timer),
-              _buildStepItem(4, '查看结果', Icons.visibility),
+              _buildStepItem(1, l10n?.extractSample ?? '取出样本', Icons.science),
+              _buildStepItem(2, l10n?.dropToTestCard ?? '滴入检测卡', Icons.water_drop),
+              _buildStepItem(3, l10n?.waitForReaction ?? '等待反应', Icons.timer),
+              _buildStepItem(4, l10n?.viewResults ?? '查看结果', Icons.visibility),
             ],
           ),
         ],

lib/features/home/widgets/program_list.dart

@@ -102,6 +102,7 @@ class _ProgramCard extends StatelessWidget {
     final dateFormat = DateFormat('yyyy-MM-dd HH:mm');
     final createdAt = _parseDate(program.createdAt);
 
+    final l10n = AppLocalizations.of(context);
     return Material(
       color: Colors.transparent,
       child: InkWell(
@@ -168,7 +169,9 @@ class _ProgramCard extends StatelessWidget {
                             borderRadius: BorderRadius.circular(4),
                           ),
                           child: Text(
-                            program.status == 1 ? '启用' : '停用',
+                            program.status == 1
+                                ? (l10n?.enabled ?? '启用')
+                                : (l10n?.disabled ?? '停用'),
                             style: TextStyle(
                               color: program.status == 1
                                   ? AppTheme.statusRunning

lib/features/home/widgets/status_bar.dart

@@ -263,13 +263,14 @@ class _SerialConnectionIndicator extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context);
     final connected = state == SerialConnectionState.connected;
     final connecting = state == SerialConnectionState.connecting;
     final text = connected
-        ? '已连接'
+        ? (l10n?.serialConnected ?? '已连接')
         : connecting
-            ? '连接中'
-            : '未连接';
+            ? (l10n?.serialConnecting ?? '连接中')
+            : (l10n?.serialDisconnected ?? '未连接');
     final color = connected
         ? AppTheme.statusRunning
         : connecting