refactor: share config adapter allowFrom and defaultTo helpers

extensions/slack/src/channel.ts

@@ -2,6 +2,8 @@ import {
   buildAccountScopedDmSecurityPolicy,
   collectOpenGroupPolicyConfiguredRouteWarnings,
   formatAllowFromLowercase,
+  mapAllowFromEntries,
+  resolveOptionalConfigString,
 } from "openclaw/plugin-sdk";
 import {
   applyAccountNameToChannelSection,
@@ -166,10 +168,10 @@ export const slackPlugin: ChannelPlugin<ResolvedSlackAccount> = {
       appTokenSource: account.appTokenSource,
     }),
     resolveAllowFrom: ({ cfg, accountId }) =>
-      (resolveSlackAccount({ cfg, accountId }).dm?.allowFrom ?? []).map((entry) => String(entry)),
+      mapAllowFromEntries(resolveSlackAccount({ cfg, accountId }).dm?.allowFrom),
     formatAllowFrom: ({ allowFrom }) => formatAllowFromLowercase({ allowFrom }),
     resolveDefaultTo: ({ cfg, accountId }) =>
-      resolveSlackAccount({ cfg, accountId }).config.defaultTo?.trim() || undefined,
+      resolveOptionalConfigString(resolveSlackAccount({ cfg, accountId }).config.defaultTo),
   },
   security: {
     resolveDmPolicy: ({ cfg, accountId, account }) => {