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/sqlite.ts

@@ -54,6 +54,7 @@ export const users = sqliteTable("user", {
   image: text(),
   password: text(),
   provider: text().$type<SupportedAuthProvider>().default("credentials").notNull(),
+  disabled: int({ mode: "boolean" }).default(false).notNull(),
   homeBoardId: text().references((): AnySQLiteColumn => boards.id, {
     onDelete: "set null",
   }),