Add admin interface, auto-promote admin email, fix sender name

Agent-Logs-Url: https://github.com/christianlouis/pop_puller_to_gmail/sessions/98c1f90b-0287-4908-a0be-ad066c453cc5

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

backend/app/services/gmail_service.py

@@ -276,12 +276,12 @@ class GmailService:
             delivery is functioning as expected.  Feel free to delete it.
 
             Best regards,
-            Christian Loris
+            Christian Krakau-Louis
             DocuElevate
             """)
 
         msg = MIMEText(body, "plain", "utf-8")
-        msg["From"] = "Christian Loris <christian@docuelevate.org>"
+        msg["From"] = "Christian Krakau-Louis <christian@docuelevate.org>"
         msg["To"] = recipient_email
         msg["Subject"] = subject
         msg["Date"] = format_datetime(now)