refactor: 死代码清理 + 趋势图重构 + 侧边栏交互优化 + 智能体卡片去延迟

- 死代码清理: 删除 AppCard/AppMenuItem/AppTabChip/AppButtons 等 4 个未使用 Widget 文件; 清理 common_widgets/enterprise_widgets/app_status_badge 中未使用 class; 移除 HealthService 等未使用方法; 后端移除 ExerciseService.CreateFromItemsAsync/HealthArchiveService.GetOrCreateAsync/MedicationAgentHandler 死分支/ChatRequest DTO
- 趋势图: 直线折线 + 渐变填充 + 阴影; 去网格; X 轴日+月份; Y 轴整数刻度最多 4 个; 点击数据点/录入记录显示上方浮层; 选中点变实心
- 侧边栏: 对话记录改单选删除(灰底高亮); 操作栏浮层修复触摸问题; 常用功能/健康仪表盘间距收紧; _Panel 去外框
- 智能体: 欢迎卡片去掉 400ms 延迟; 胶囊去阴影
- 其他: api_client IP 适配; 多页面 UI 微调; 新增 chat_provider/prelaunch_guardrails 测试

health_app/test/prelaunch_guardrails_test.dart

@@ -0,0 +1,37 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:health_app/models/ble_device.dart';
+import 'package:health_app/pages/chart/trend_page.dart';
+import 'package:health_app/pages/remaining_pages.dart';
+import 'package:health_app/services/health_ble_service.dart';
+
+void main() {
+  test('unknown trend metric falls back to blood pressure', () {
+    expect(normalizeTrendMetricType('unknown_metric'), 'blood_pressure');
+    expect(normalizeTrendMetricType(null), 'blood_pressure');
+    expect(normalizeTrendMetricType('spo2'), 'spo2');
+  });
+
+  test('static compliance pages include collection and sdk lists', () {
+    expect(staticTextTitle('personalInfoList'), '个人信息收集清单');
+    expect(staticTextContent('personalInfoList'), contains('健康数据'));
+
+    expect(staticTextTitle('thirdPartySdkList'), '第三方 SDK 共享清单');
+    expect(staticTextContent('thirdPartySdkList'), contains('AI'));
+  });
+
+  test('ble sync is only implemented for blood pressure devices', () {
+    expect(
+      HealthBleService.isSyncImplemented(BleDeviceType.bloodPressure),
+      true,
+    );
+    expect(HealthBleService.isSyncImplemented(BleDeviceType.glucose), false);
+    expect(
+      HealthBleService.isSyncImplemented(BleDeviceType.weightScale),
+      false,
+    );
+    expect(
+      HealthBleService.isSyncImplemented(BleDeviceType.pulseOximeter),
+      false,
+    );
+  });
+}