fix: 管理员系统 + 注册流程重构 + UI改版 + 全链路修复

- 新增管理员角色(手机号12345678910)，管理员可增删医生、查看患者
- 注册页重构：去掉角色选择+审核码，改为选医生+填姓名
- 医生端点按DoctorId过滤患者，Patient↔Doctor关系建立
- Doctor/DoctorProfile/User实体新增关联字段
- JSON循环引用修复(IgnoreCycles)
- /api/doctors改为公开接口
- 登录闪屏修复+原生Android启动页
- 输入框全局白底+灰框
- 蓝牙重连同步修复
- Web端(doctor_web+health_app/web)全部删除
- 全局UI改版：白底企业风，新配色和组件系统
- 新品牌图标和启动图

backend/src/Health.Infrastructure/Data/dev_data_seeder.cs

@@ -1,3 +1,5 @@
+using Health.Domain.Entities;
+using Health.Domain.Enums;
 using Microsoft.Extensions.Configuration;
 
 namespace Health.Infrastructure.Data;
@@ -20,11 +22,41 @@ public static class DevDataSeeder
         // 检查是否已有测试用户（避免重复填充）
         if (db.Users.Any(u => u.Phone == "13800000001")) return;
 
+        // ---- 种子医生数据 ----
+        if (!db.Doctors.Any())
+        {
+            var doctor1 = new Doctor
+            {
+                Id = Guid.NewGuid(), Name = "张明", Title = "主任医师",
+                Department = "心脏康复科", Phone = "13800000002",
+                ProfessionalDirection = "冠心病康复、术后管理",
+                IsActive = true, CreatedAt = DateTime.UtcNow,
+            };
+            var doctor2 = new Doctor
+            {
+                Id = Guid.NewGuid(), Name = "李芳", Title = "副主任医师",
+                Department = "营养科", Phone = "13800000003",
+                ProfessionalDirection = "糖尿病管理、饮食指导",
+                IsActive = true, CreatedAt = DateTime.UtcNow,
+            };
+            var doctor3 = new Doctor
+            {
+                Id = Guid.NewGuid(), Name = "王建国", Title = "主任医师",
+                Department = "心血管内科", Phone = "13800000004",
+                ProfessionalDirection = "高血压管理、PCI术后随访",
+                IsActive = true, CreatedAt = DateTime.UtcNow,
+            };
+            db.Doctors.AddRange(doctor1, doctor2, doctor3);
+            await db.SaveChangesAsync();
+        }
+
         // ---- 创建测试患者 ----
+        var doctorWang = db.Doctors.FirstOrDefault(d => d.Name == "王建国");
         var user = new User
         {
             Id = Guid.NewGuid(), Phone = "13800000001", Name = "张三",
             Gender = "男", BirthDate = new DateOnly(1970, 3, 15),
+            DoctorId = doctorWang?.Id,
             CreatedAt = DateTime.UtcNow, UpdatedAt = DateTime.UtcNow,
         };
         db.Users.Add(user);