feat: banner docker RBD

apps/organization/views.py

@@ -102,16 +102,18 @@ class CmsInstitutionViewSet(viewsets.ModelViewSet):
         if ext not in ALLOWED_BANNER_EXT:
             raise AppError('CMS_BANNER_BAD_TYPE', '仅支持 png/jpg/jpeg/webp 图片', status_code=400)
 
-        rel_dir = 'institutions'
+        # 上传图片落在 static/uploads/ 下——该目录由 Docker 持久卷挂载（容器重启不丢），
+        # 与镜像内置静态（如 institutions/default_hospital.png）分开，避免被卷覆盖。
+        rel_dir = 'uploads/institutions'
         base_static = settings.STATICFILES_DIRS[0]
-        target_dir = os.path.join(base_static, rel_dir)
+        target_dir = os.path.join(base_static, 'uploads', 'institutions')
         os.makedirs(target_dir, exist_ok=True)
         filename = f'inst_{inst.id}_banner{ext}'
         with open(os.path.join(target_dir, filename), 'wb') as fh:
             for chunk in file.chunks():
                 fh.write(chunk)
 
-        inst.banner_url = f'{rel_dir}/{filename}'
+        inst.banner_url = f'{rel_dir}/{filename}'   # 例：uploads/institutions/inst_17_banner.png
         inst.save(update_fields=['banner_url', 'updated_at'])
 
         serializer = self.get_serializer(inst)