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

backend/src/Health.Application/HealthArchives/HealthArchiveContracts.cs

@@ -37,7 +37,6 @@ public sealed record HealthArchiveUpdateRequest(
 public interface IHealthArchiveService
 {
     Task<HealthArchiveDto?> GetAsync(Guid userId, CancellationToken ct);
-    Task<HealthArchiveDto> GetOrCreateAsync(Guid userId, CancellationToken ct);
     Task<HealthArchiveDto> UpdateAsync(Guid userId, HealthArchiveUpdateRequest request, CancellationToken ct);
     Task<object> ExecuteAiActionAsync(Guid userId, string action, HealthArchiveUpdateRequest request, CancellationToken ct);
 }

backend/src/Health.Application/HealthArchives/HealthArchiveService.cs

@@ -12,13 +12,6 @@ public sealed class HealthArchiveService(IHealthArchiveRepository archives) : IH
         return archive == null ? null : ToDto(archive);
     }
 
-    public async Task<HealthArchiveDto> GetOrCreateAsync(Guid userId, CancellationToken ct)
-    {
-        var archive = await GetOrCreateEntityAsync(userId, ct);
-        await _archives.SaveChangesAsync(ct);
-        return ToDto(archive);
-    }
-
     public async Task<HealthArchiveDto> UpdateAsync(Guid userId, HealthArchiveUpdateRequest request, CancellationToken ct)
     {
         var archive = await GetOrCreateEntityAsync(userId, ct);