refactor: dedupe channel plugin shared assembly

extensions/slack/src/shared.ts

@@ -3,6 +3,7 @@ import {
   createScopedAccountConfigAccessors,
   createScopedChannelConfigBase,
 } from "openclaw/plugin-sdk/channel-config-helpers";
+import { createChannelPluginBase } from "openclaw/plugin-sdk/core";
 import {
   formatDocsLink,
   hasConfiguredSecretInput,
@@ -176,7 +177,7 @@ export function createSlackPluginBase(params: {
   | "config"
   | "setup"
 > {
-  return {
+  return createChannelPluginBase({
     id: SLACK_CHANNEL,
     meta: {
       ...getChatChannelMeta(SLACK_CHANNEL),
@@ -220,5 +221,17 @@ export function createSlackPluginBase(params: {
       ...slackConfigAccessors,
     },
     setup: params.setup,
-  };
+  }) as Pick<
+    ChannelPlugin<ResolvedSlackAccount>,
+    | "id"
+    | "meta"
+    | "setupWizard"
+    | "capabilities"
+    | "agentPrompt"
+    | "streaming"
+    | "reload"
+    | "configSchema"
+    | "config"
+    | "setup"
+  >;
 }