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/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;