Feat(Fix): Multi-Tenant Zerotier Org Setups

Imports Network From Zerotier
Async Emails
Migration guardrails
Admin to see all approvals states

gatehouse_app/api/v1/organizations/invites.py

@@ -37,7 +37,7 @@ def create_org_invite(org_id):
     app_url = current_app.config.get("APP_URL", "http://localhost:8080")
     invite_link = f"{app_url}/invite?token={invite.token}"
 
-    email_sent = NotificationService._send_email(
+    NotificationService._send_email_async(
         to_address=email,
         subject=f"You're invited to join {org.name} on Gatehouse",
         body=(
@@ -47,16 +47,8 @@ def create_org_invite(org_id):
             f"Gatehouse Security Team"
         ),
     )
-
-    if not email_sent:
-        logging.getLogger(__name__).warning(
-            f"[INVITE LINK] Email not sent (EMAIL_ENABLED=False or SMTP down). "
-            f"Invite for {email} → {invite_link}"
-        )
-    else:
-        logging.getLogger(__name__).info(
-            f"[INVITE] Email sent successfully to {email}"
-        )
+    logging.getLogger(__name__).info(f"[INVITE] Email queued for {email}")
+    email_sent = True  # async — assume queued successfully
 
     response_data = {
         "invite": {

gatehouse_app/api/v1/organizations/members.py

@@ -161,7 +161,7 @@ def send_mfa_reminder(org_id, user_id):
     if compliance and policy and compliance.deadline_at:
         NotificationService.send_mfa_deadline_reminder(user, compliance, policy)
     else:
-        NotificationService._send_email(
+        NotificationService._send_email_async(
             to_address=user.email,
             subject="Reminder: Set up multi-factor authentication",
             body=(