feat: admin system with invite-only registration

src/db/schema.ts

@@ -8,10 +8,24 @@ export const users = pgTable('users', {
   name: text('name').notNull(),
   emailVerified: boolean('email_verified').default(false),
   image: text('image'),
+  role: text('role').default('user'), // 'admin' | 'user'
   createdAt: timestamp('created_at').defaultNow().notNull(),
   updatedAt: timestamp('updated_at').defaultNow().notNull(),
 });
 
+// Invites table
+export const invites = pgTable('invites', {
+  id: uuid('id').primaryKey().defaultRandom(),
+  email: text('email').notNull(),
+  name: text('name').notNull(),
+  role: text('role').default('user').notNull(),
+  token: text('token').notNull().unique(),
+  invitedBy: text('invited_by').references(() => users.id, { onDelete: 'set null' }),
+  status: text('status').default('pending').notNull(), // 'pending' | 'accepted' | 'expired'
+  expiresAt: timestamp('expires_at').notNull(),
+  createdAt: timestamp('created_at').defaultNow().notNull(),
+});
+
 // User profile (additional settings beyond BetterAuth)
 export const userProfiles = pgTable('user_profiles', {
   id: uuid('id').primaryKey().defaultRandom(),