feat: add Immich integration module with API endpoints and admin interface

backend/server/integrations/models.py

@@ -0,0 +1,12 @@
+from django.db import models
+from django.contrib.auth import get_user_model
+
+User = get_user_model()
+
+class ImmichIntegration(models.Model):
+    server_url = models.CharField(max_length=255)
+    api_key = models.CharField(max_length=255)
+    user = models.ForeignKey(User, on_delete=models.CASCADE)
+
+    def __str__(self):
+        return self.user.username + ' - ' + self.server_url