feat: update medical training case and auth modules

apps/user/auth/__init__.py

@@ -1,5 +1,7 @@
 from rest_framework_simplejwt.tokens import RefreshToken
 
+from config.exceptions import AppError
+
 ALLOWED_ROLE_TYPES = ('student', 'doctor', 'teacher')
 
 
@@ -9,17 +11,42 @@ def get_tokens_for_user(user):
 
 
 def build_user_response(user):
+    inst = user.institution if user.institution_id else None
     return {
         'id': user.id,
         'username': user.username,
         'phone': user.phone,
         'real_name': user.real_name,
         'role_type': user.role_type,
-        'institution': user.institution.name if user.institution_id else None,
+        'institution_code': inst.code if inst else None,
+        'institution_name': inst.name if inst else None,
         'department': user.department.name if user.department_id else None,
     }
 
 
+def resolve_or_create_institution(code, name):
+    """按机构编码查找，不存在则自动创建。
+
+    Args:
+        code: 机构编码（必填，唯一标识）
+        name: 机构名称（必填，创建时使用）
+    Returns:
+        Institution 实例
+    """
+    from apps.user.models import Institution
+
+    if not code:
+        raise AppError('USER_INSTITUTION_CODE_REQUIRED', '机构编码不能为空')
+    if not name:
+        raise AppError('USER_INSTITUTION_REQUIRED', '机构名称不能为空')
+
+    institution, _ = Institution.objects.get_or_create(
+        code=code,
+        defaults={'name': name, 'type': 'hospital'},
+    )
+    return institution
+
+
 def get_client_ip(request):
     xff = request.META.get('HTTP_X_FORWARDED_FOR')
     if xff: