feat: UI全面改造 + 后端多项修复

【后端修复】
- 删除diet/consultation agent假工具声明
- 修复DayOfWeek实体注释
- 修复Vision API content序列化
- cleanup_service级联删除修复
- 用药提醒时区偏差修复
- 统一DateTime处理(UtcNow+8)
- 新增UTC DateTime JSON转换器

【前端UI重构】
- 配色体系全面更新(#8B5CF6淡紫+#F0ECFF背景)
- 登录页重设计
- 首页重设计(透明顶栏、渐变背景、胶囊输入区)
- 聊天卡片加白蓝边框、渐变标题
- 侧边栏重构(渐变背景、合并顶部、删除底部设置)
- 确认卡片可编辑字段恢复
- 所有子页面加返回按钮
- catch异常加日志
- 删除后refresh provider缓存

backend/src/Health.WebApi/BackgroundServices/cleanup_service.cs

@@ -17,17 +17,29 @@ public sealed class CleanupService(IServiceScopeFactory scopeFactory, ILogger<Cl
                 using var scope = _scopeFactory.CreateScope();
                 var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
 
-                // 清理 30 天前的对话记录
+                // 清理 30 天前的对话记录（先删消息再删对话，避免 FK 冲突）
                 var cutoff = DateTime.UtcNow.AddDays(-30);
-                var oldConversations = await db.Conversations
-                    .Where(c => c.CreatedAt < cutoff)
+                var oldConvIds = await db.Conversations
+                    .Where(c => c.UpdatedAt < cutoff)
+                    .Select(c => c.Id)
                     .ToListAsync(stoppingToken);
 
-                if (oldConversations.Count > 0)
+                if (oldConvIds.Count > 0)
                 {
+                    // 先批量删消息
+                    var oldMessages = await db.ConversationMessages
+                        .Where(m => oldConvIds.Contains(m.ConversationId))
+                        .ToListAsync(stoppingToken);
+                    db.ConversationMessages.RemoveRange(oldMessages);
+
+                    // 再删对话
+                    var oldConversations = await db.Conversations
+                        .Where(c => oldConvIds.Contains(c.Id))
+                        .ToListAsync(stoppingToken);
                     db.Conversations.RemoveRange(oldConversations);
+
                     await db.SaveChangesAsync(stoppingToken);
-                    _logger.LogInformation("清理 {Count} 条过期对话", oldConversations.Count);
+                    _logger.LogInformation("清理 {Count} 条过期对话", oldConvIds.Count);
                 }
 
                 // 清理过期验证码

backend/src/Health.WebApi/BackgroundServices/medication_reminder_service.cs

@@ -31,13 +31,12 @@ public sealed class MedicationReminderService(IServiceScopeFactory scopeFactory,
     {
         using var scope = _scopeFactory.CreateScope();
         var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
-        // 使用北京时间（UTC+8）
-        var beijingNow = DateTime.UtcNow.AddHours(8);
-        var beijingTime = TimeOnly.FromDateTime(beijingNow);
-        var todayStart = DateTime.SpecifyKind(beijingNow.Date, DateTimeKind.Utc);
+        // 北京时间今天0点 → 转为UTC
+        var beijingToday = DateTime.UtcNow.AddHours(8).Date;
+        var todayStartUtc = beijingToday.AddHours(-8);
 
-        // 查询：启用的用药计划 AND 服药时间在当前时间前后5分钟窗口内（防止服务重启错过提醒）
-        // 处理跨午夜情况
+        // 查询：启用的用药计划 AND 服药时间在当前时间前后5分钟窗口内
+        var beijingTime = TimeOnly.FromDateTime(DateTime.UtcNow.AddHours(8));
         var windowStart = beijingTime.AddMinutes(-5);
         var medications = await db.Medications
             .Where(m => m.IsActive)
@@ -47,10 +46,10 @@ public sealed class MedicationReminderService(IServiceScopeFactory scopeFactory,
 
         foreach (var med in medications)
         {
-            // 检查今天是否已打卡
+            // 检查今天是否已打卡（用正确的北京时间区间）
             var alreadyLogged = await db.MedicationLogs
                 .AnyAsync(l => l.MedicationId == med.Id
-                    && l.CreatedAt >= todayStart
+                    && l.CreatedAt >= todayStartUtc
                     && l.Status == MedicationLogStatus.Taken, ct);
 
             if (alreadyLogged) continue;

backend/src/Health.WebApi/Endpoints/ai_chat_endpoints.cs

@@ -291,7 +291,7 @@ public static class AiChatEndpoints
                     var result = response.Choices?.FirstOrDefault()?.Message?.Content ?? "{}";
                     // 记录VLM原始返回用于排查
                     var uploadsDir2 = Path.Combine(Directory.GetCurrentDirectory(), "uploads");
-                    var logPath = Path.Combine(uploadsDir2, $"vlm_log_{DateTime.Now:HHmmss}.txt");
+                    var logPath = Path.Combine(uploadsDir2, $"vlm_log_{DateTime.UtcNow:HHmmss}.txt");
                     await File.WriteAllTextAsync(logPath, $"MODEL: {Environment.GetEnvironmentVariable("VLM_MODEL")}\nIMAGE_SIZE: {imageUrls.FirstOrDefault()?.Length ?? 0}\nRESPONSE:\n{result}", ct);
                     return Results.Ok(new { code = 0, data = result, message = (string?)null });
                 }
@@ -340,7 +340,6 @@ public static class AiChatEndpoints
         AgentType.Unified => [
             HealthDataAgentHandler.RecordHealthDataTool,
             CommonAgentHandler.QueryHealthRecordsTool,
-            DietAgentHandler.EstimateFoodTool,
             MedicationAgentHandler.ManageMedicationTool,
             ExerciseAgentHandler.ManageExerciseTool,
             CommonAgentHandler.CheckArchiveTool,
@@ -359,13 +358,11 @@ public static class AiChatEndpoints
             "query_health_records" => CommonAgentHandler.Execute(toolName, root, db, userId),
             "check_archive" => CommonAgentHandler.Execute(toolName, root, db, userId),
             "manage_medication" => MedicationAgentHandler.Execute(toolName, root, db, userId),
-            "estimate_food_text" => DietAgentHandler.Execute(toolName, root, db, userId),
             "analyze_report" => visionClient != null
                 ? ReportAgentHandler.AnalyzeReport(db, userId, root, visionClient)
                 : Task.FromResult<object>(new { success = false, message = "VLM服务未配置" }),
             "manage_exercise" => ExerciseAgentHandler.Execute(toolName, root, db, userId),
             "manage_archive" => CommonAgentHandler.ExecuteManageArchive(db, userId, root),
-            "request_doctor" => ConsultationAgentHandler.Execute(toolName, root, db, userId),
             _ => Task.FromResult<object>(new { success = false, message = $"未知工具: {toolName}" })
         };
     }
@@ -470,9 +467,6 @@ public static class AiChatEndpoints
                     metadata["recordTime"] = DateTime.UtcNow.AddHours(8).ToString("MM月dd日 HH:mm");
                 }
                 break;
-            case "estimate_food_text":
-                messageType = "diet_analysis";
-                break;
             case "analyze_report":
                 messageType = "report_analysis";
                 break;

backend/src/Health.WebApi/Endpoints/diet_endpoints.cs

@@ -35,7 +35,7 @@ public static class DietEndpoints
                 MealType = Enum.TryParse<MealType>(root.TryGetProperty("mealType", out var mt) ? mt.GetString() : "Lunch", out var meal) ? meal : MealType.Lunch,
                 TotalCalories = root.TryGetProperty("totalCalories", out var tc) ? tc.GetInt32() : null,
                 HealthScore = root.TryGetProperty("healthScore", out var hs) ? hs.GetInt32() : null,
-                RecordedAt = root.TryGetProperty("recordedAt", out var ra) && DateOnly.TryParse(ra.GetString(), out var d) ? d : DateOnly.FromDateTime(DateTime.Now),
+                RecordedAt = root.TryGetProperty("recordedAt", out var ra) && DateOnly.TryParse(ra.GetString(), out var d) ? d : DateOnly.FromDateTime(DateTime.UtcNow.AddHours(8)),
             };
             if (root.TryGetProperty("foodItems", out var items))
             {

backend/src/Health.WebApi/Endpoints/exercise_endpoints.cs

@@ -45,8 +45,8 @@ public static class ExerciseEndpoints
             var root = json.RootElement;
             var exerciseType = root.TryGetProperty("exerciseType", out var et) ? et.GetString()! : "运动";
             var duration = root.TryGetProperty("durationMinutes", out var dm) ? dm.GetInt32() : 30;
-            var startDate = DateOnly.Parse((root.TryGetProperty("startDate", out var sd) ? sd.GetString()! : DateTime.Now.ToString("yyyy-MM-dd")));
-            var endDate = DateOnly.Parse((root.TryGetProperty("endDate", out var ed) ? ed.GetString()! : DateTime.Now.AddDays(6).ToString("yyyy-MM-dd")));
+            var startDate = DateOnly.Parse((root.TryGetProperty("startDate", out var sd) ? sd.GetString()! : DateTime.UtcNow.AddHours(8).ToString("yyyy-MM-dd")));
+            var endDate = DateOnly.Parse((root.TryGetProperty("endDate", out var ed) ? ed.GetString()! : DateTime.UtcNow.AddHours(8).AddDays(6).ToString("yyyy-MM-dd")));
             var plan = new ExercisePlan { Id = Guid.NewGuid(), UserId = userId, WeekStartDate = startDate };
             for (var d = startDate; d <= endDate; d = d.AddDays(1))
             {

backend/src/Health.WebApi/Endpoints/medication_endpoints.cs

@@ -12,12 +12,16 @@ public static class MedicationEndpoints
             var query = db.Medications.Where(m => m.UserId == userId);
             if (filter == "active") query = query.Where(m => m.IsActive);
             else if (filter == "inactive") query = query.Where(m => !m.IsActive);
+            // 北京时间今天对应的 UTC 区间
+            var beijingToday = DateTime.UtcNow.AddHours(8).Date;
+            var todayStartUtc = beijingToday.AddHours(-8);
+            var todayEndUtc = todayStartUtc.AddDays(1);
             var meds = await query.OrderByDescending(m => m.CreatedAt).Select(m => new
             {
                 m.Id, m.Name, m.Dosage, Frequency = m.Frequency.ToString(),
                 m.TimeOfDay, m.StartDate, m.EndDate, m.IsActive, m.Notes,
                 Source = m.Source.ToString(), m.CreatedAt, m.UpdatedAt,
-                todayTaken = m.Logs.Any(l => l.CreatedAt.Date == DateTime.UtcNow.Date && l.Status == MedicationLogStatus.Taken)
+                todayTaken = m.Logs.Any(l => l.CreatedAt >= todayStartUtc && l.CreatedAt < todayEndUtc && l.Status == MedicationLogStatus.Taken)
             }).ToListAsync(ct);
             return Results.Ok(new { code = 0, data = meds, message = (string?)null });
         });
@@ -86,8 +90,10 @@ public static class MedicationEndpoints
         group.MapPost("/{id:guid}/confirm", async (Guid id, HttpContext http, AppDbContext db, CancellationToken ct) =>
         {
             var userId = GetUserId(http);
-            var today = DateOnly.FromDateTime(DateTime.UtcNow);
-            var existing = await db.MedicationLogs.FirstOrDefaultAsync(l => l.MedicationId == id && l.CreatedAt.Date == DateTime.UtcNow.Date && l.Status == MedicationLogStatus.Taken, ct);
+            var beijingToday = DateTime.UtcNow.AddHours(8).Date;
+            var todayStartUtc = beijingToday.AddHours(-8);
+            var todayEndUtc = todayStartUtc.AddDays(1);
+            var existing = await db.MedicationLogs.FirstOrDefaultAsync(l => l.MedicationId == id && l.CreatedAt >= todayStartUtc && l.CreatedAt < todayEndUtc && l.Status == MedicationLogStatus.Taken, ct);
             if (existing != null) {
                 db.MedicationLogs.Remove(existing);
                 await db.SaveChangesAsync(ct);
@@ -96,7 +102,7 @@ public static class MedicationEndpoints
             var log = new MedicationLog
             {
                 Id = Guid.NewGuid(), MedicationId = id, UserId = userId,
-                Status = MedicationLogStatus.Taken, ScheduledTime = TimeOnly.FromDateTime(DateTime.Now), ConfirmedAt = DateTime.UtcNow,
+                Status = MedicationLogStatus.Taken, ScheduledTime = TimeOnly.FromDateTime(DateTime.UtcNow.AddHours(8)), ConfirmedAt = DateTime.UtcNow,
             };
             db.MedicationLogs.Add(log);
             await db.SaveChangesAsync(ct);

backend/src/Health.WebApi/Endpoints/user_endpoints.cs

@@ -50,7 +50,11 @@ public static class UserEndpoints
         {
             var userId = GetUserId(http);
             var archive = await db.HealthArchives.FirstOrDefaultAsync(a => a.UserId == userId, ct);
-            if (archive == null) return Results.Ok(new { code = 40004, message = "档案不存在" });
+            if (archive == null)
+            {
+                archive = new HealthArchive { Id = Guid.NewGuid(), UserId = userId };
+                db.HealthArchives.Add(archive);
+            }
 
             archive.Diagnosis = req.Diagnosis ?? archive.Diagnosis;
             archive.SurgeryType = req.SurgeryType ?? archive.SurgeryType;

backend/src/Health.WebApi/Program.cs

@@ -3,6 +3,7 @@ using Health.Infrastructure.AI;
 using Health.Infrastructure.Data;
 using Health.Infrastructure.Services;
 using Health.WebApi.BackgroundServices;
+using Health.WebApi.Converters;
 using Health.WebApi.Endpoints;
 using Health.WebApi.Middleware;
 using Microsoft.AspNetCore.Authentication.JwtBearer;
@@ -27,10 +28,11 @@ if (File.Exists(envPath))
 
 var builder = WebApplication.CreateBuilder(args);
 
-// ---- JSON 配置（枚举字符串、camelCase）----
+// ---- JSON 配置（枚举字符串、camelCase、UTC时间统一带Z）----
 builder.Services.ConfigureHttpJsonOptions(options =>
 {
     options.SerializerOptions.Converters.Add(new System.Text.Json.Serialization.JsonStringEnumConverter());
+    options.SerializerOptions.Converters.Add(new UtcDateTimeConverter());
     options.SerializerOptions.PropertyNamingPolicy = System.Text.Json.JsonNamingPolicy.CamelCase;
     options.SerializerOptions.PropertyNameCaseInsensitive = true;
 });

backend/src/Health.WebApi/UtcDateTimeConverter.cs

@@ -0,0 +1,24 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Health.WebApi.Converters;
+
+/// <summary>
+/// 统一 DateTime 序列化为 ISO 8601 UTC 格式（始终带 Z 后缀），
+/// 前端解析时可通过 Z 识别为 UTC 时间并自动转本地时间显示。
+/// </summary>
+public sealed class UtcDateTimeConverter : JsonConverter<DateTime>
+{
+    public override DateTime Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        => reader.GetDateTime();
+
+    public override void Write(Utf8JsonWriter writer, DateTime value, JsonSerializerOptions options)
+    {
+        // 始终按 UTC 写出，带 Z 后缀
+        writer.WriteStringValue(value.Kind == DateTimeKind.Local
+            ? value.ToUniversalTime()
+            : value.Kind == DateTimeKind.Unspecified
+                ? DateTime.SpecifyKind(value, DateTimeKind.Utc)
+                : value);
+    }
+}