🔑 Add Customer Sign-In to Your App

People keep asking to use the app I built for myself. Build me customer sign-in for it. Let someone create an account with their email, sign in, and manage their own profile and password. Every record in the app that belongs to a customer must carry the owner, and the app must show a signed-in customer only their own records. Set this up explicitly rather than assuming it happens by itself, and give me a way to test it by signing in as a second account and confirming I cannot see the first account's data. Add an admin area where I can see all accounts, when they last signed in, and how much they are using. Add an AI agent inside the customer area that answers questions using only that customer's own records, and hands anything else to me. Automate two things: a welcome message when an account is created, and a scheduled weekly summary to me of new sign-ups and accounts that have gone quiet. Two logins: a customer who sees only their own data, and an owner who sees everything.