refactor: single doctor, direct chat, any phone login, UI polish, fix animations

backend/src/HealthManager.WebApi/Controllers/AuthController.cs

@@ -26,9 +26,20 @@ public class AuthController(
     {
         var user = await authService.GetUserByPhoneAsync(request.Phone);
         if (user == null)
-            return Unauthorized(new { message = "用户不存在" });
+        {
+            // Demo: auto-register new users
+            var db = HttpContext.RequestServices.GetRequiredService<Infrastructure.Data.AppDbContext>();
+            user = new User
+            {
+                Phone = request.Phone,
+                Name = "用户" + request.Phone[^4..],
+                Role = "patient",
+                PasswordHash = AuthService.HashPassword("demo123"),
+            };
+            db.Users.Add(user);
+            await db.SaveChangesAsync();
+        }
 
-        // Demo: accept any SMS code
         var accessToken = jwtProvider.GenerateAccessToken(user.Id, user.Name, user.Role);
         var refreshToken = jwtProvider.GenerateRefreshToken();
         await authService.SaveRefreshTokenAsync(user.Id, refreshToken, DateTime.UtcNow.AddDays(7));