refactor: remove username from User model, login by email only

prisma/bootstrap-admin.ts

@@ -3,7 +3,6 @@ import { getPasswordHash } from "@/lib/security"
 import prisma from "../src/lib/prisma"
 
 type BootstrapAdminInput = {
-  username: string
   email: string
   name: string
   password: string
@@ -12,7 +11,6 @@ type BootstrapAdminInput = {
 function getBootstrapAdminInput(): BootstrapAdminInput {
   const isProduction = process.env.NODE_ENV === "production"
 
-  const username = process.env.ADMIN_USERNAME ?? "admin"
   const email = process.env.ADMIN_EMAIL ?? "admin@localhost"
   const name = process.env.ADMIN_NAME ?? "Administrator"
   const password = process.env.ADMIN_PASSWORD
@@ -22,7 +20,6 @@ function getBootstrapAdminInput(): BootstrapAdminInput {
   }
 
   return {
-    username,
     email,
     name,
     password: password ?? "admin",
@@ -55,7 +52,6 @@ export async function bootstrapAdmin(client: typeof prisma) {
     },
     create: {
       name: admin.name,
-      username: admin.username,
       email: admin.email,
       role: "ADMIN",
       password: await getPasswordHash(admin.password),