feat(users): add ability to disable users without deleting them

- Add disabled boolean field to user schema (PostgreSQL, MySQL, SQLite)
- Block disabled users from logging in via any auth provider (credentials, LDAP, OIDC)
- Check disabled status in session callback to prevent session replay
- Add changeDisabled API endpoint (admin-only)
- Include disabled field in getById and getAll user endpoints
- Add disable/enable user toggle in admin UI with status badge in user list

packages/db/schema/postgresql.ts

@@ -71,6 +71,7 @@ export const users = pgTable("user", {
   image: text(),
   password: text(),
   provider: varchar({ length: 64 }).$type<SupportedAuthProvider>().default("credentials").notNull(),
+  disabled: boolean().default(false).notNull(),
   homeBoardId: varchar({ length: 64 }).references((): AnyPgColumn => boards.id, {
     onDelete: "set null",
   }),