feat: 长辈模式（大字大按钮 + 偏好按账号隔离）+ 语音输入（按住说话 + 实时转写 + 后端代理 DashScope ASR + 患者端专用）+ 健康仪表盘背景渐变

health_app/lib/core/api_client.dart

@@ -9,7 +9,7 @@ const String baseUrl = String.fromEnvironment(
   'API_BASE_URL',
   defaultValue: kReleaseMode
       ? 'https://erpapi.datalumina.cn/xiaomai'
-      : 'http://192.168.1.34:5000',
+      : 'http://10.4.178.175:5000',
 );
 
 class ApiException implements Exception {

health_app/lib/core/app_router.dart

@@ -11,6 +11,7 @@ import '../pages/report/report_pages.dart';
 import '../pages/report/ai_analysis_page.dart';
 import '../pages/consultation/consultation_pages.dart';
 import '../pages/settings/settings_pages.dart';
+import '../pages/settings/elder_mode_page.dart';
 import '../pages/settings/notification_prefs_page.dart';
 import '../pages/notifications/notification_center_page.dart';
 import '../pages/history/conversation_history_page.dart';
@@ -127,6 +128,8 @@ Widget buildPage(RouteInfo route, WidgetRef ref) {
       return const FollowUpListPage();
     case 'settings':
       return const SettingsPage();
+    case 'elderMode':
+      return const ElderModePage();
     case 'notificationPrefs':
       return const NotificationPrefsPage();
     case 'notifications':

health_app/lib/core/app_theme.dart

@@ -776,6 +776,74 @@ class AppTheme {
     ),
   );
 
+  /// 长辈模式只在已登录的患者端启用。这里提高主题级控件尺寸，页面中写死的
+  /// 字号再由 ElderModeScope 提供的文本缩放统一兜底。
+  static ThemeData get elderLightTheme {
+    final base = lightTheme;
+    return base.copyWith(
+      appBarTheme: base.appBarTheme.copyWith(
+        toolbarHeight: 60,
+        titleTextStyle: const TextStyle(
+          fontSize: 24,
+          fontWeight: FontWeight.w700,
+          color: text,
+        ),
+        iconTheme: const IconThemeData(size: 28, color: text),
+      ),
+      textTheme: base.textTheme.copyWith(
+        headlineLarge: const TextStyle(
+          fontSize: 28,
+          fontWeight: FontWeight.w700,
+          color: text,
+        ),
+        titleLarge: const TextStyle(
+          fontSize: 22,
+          fontWeight: FontWeight.w700,
+          color: text,
+        ),
+        titleMedium: const TextStyle(
+          fontSize: 19,
+          fontWeight: FontWeight.w600,
+          color: text,
+        ),
+        bodyLarge: const TextStyle(fontSize: 18, color: text, height: 1.5),
+        bodyMedium: const TextStyle(fontSize: 16, color: textSub, height: 1.45),
+        labelMedium: const TextStyle(fontSize: 16, color: textSub),
+        labelSmall: const TextStyle(fontSize: 15, color: textHint),
+      ),
+      inputDecorationTheme: base.inputDecorationTheme.copyWith(
+        contentPadding: const EdgeInsets.symmetric(
+          horizontal: 18,
+          vertical: 16,
+        ),
+        hintStyle: const TextStyle(color: textHint, fontSize: 17),
+      ),
+      elevatedButtonTheme: ElevatedButtonThemeData(
+        style: ElevatedButton.styleFrom(
+          backgroundColor: primary,
+          foregroundColor: Colors.white,
+          minimumSize: const Size(double.infinity, 56),
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(rLg),
+          ),
+          textStyle: const TextStyle(fontSize: 18, fontWeight: FontWeight.w700),
+          elevation: 0,
+        ),
+      ),
+      outlinedButtonTheme: OutlinedButtonThemeData(
+        style: OutlinedButton.styleFrom(
+          foregroundColor: text,
+          minimumSize: const Size(52, 56),
+          side: const BorderSide(color: border),
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(rMd),
+          ),
+          textStyle: const TextStyle(fontSize: 18, fontWeight: FontWeight.w700),
+        ),
+      ),
+    );
+  }
+
   static ShadThemeData get shadTheme => ShadThemeData(
     brightness: Brightness.light,
     colorScheme: ShadVioletColorScheme.light(

health_app/lib/core/elder_mode_scope.dart

@@ -0,0 +1,42 @@
+import 'dart:math' as math;
+
+import 'package:flutter/material.dart';
+
+class ElderModeScope extends InheritedWidget {
+  final bool enabled;
+  final bool largeTextEnabled;
+
+  const ElderModeScope({
+    super.key,
+    required this.enabled,
+    required this.largeTextEnabled,
+    required super.child,
+  });
+
+  static ElderModeScope? maybeOf(BuildContext context) {
+    return context.dependOnInheritedWidgetOfExactType<ElderModeScope>();
+  }
+
+  static bool enabledOf(BuildContext context) {
+    return maybeOf(context)?.enabled == true;
+  }
+
+  static bool largeTextOf(BuildContext context) {
+    final scope = maybeOf(context);
+    return scope?.enabled == true && scope?.largeTextEnabled == true;
+  }
+
+  static TextScaler textScalerFor(BuildContext context) {
+    final systemScaler = MediaQuery.textScalerOf(context);
+    if (!largeTextOf(context)) return systemScaler;
+    final systemFactor = systemScaler.scale(1);
+    final factor = math.max(systemFactor, 1.18).clamp(1.0, 1.6).toDouble();
+    return TextScaler.linear(factor);
+  }
+
+  @override
+  bool updateShouldNotify(ElderModeScope oldWidget) {
+    return enabled != oldWidget.enabled ||
+        largeTextEnabled != oldWidget.largeTextEnabled;
+  }
+}