fix: narrow mattermost setup entry seam

extensions/mattermost/src/channel.setup.ts

@@ -0,0 +1,86 @@
+import { describeAccountSnapshot } from "openclaw/plugin-sdk/account-helpers";
+import { formatNormalizedAllowFromEntries } from "openclaw/plugin-sdk/allow-from";
+import {
+  adaptScopedAccountAccessor,
+  createScopedChannelConfigAdapter,
+} from "openclaw/plugin-sdk/channel-config-helpers";
+import type { ChannelPlugin } from "./channel-api.js";
+import { MattermostChannelConfigSchema } from "./config-surface.js";
+import {
+  listMattermostAccountIds,
+  resolveDefaultMattermostAccountId,
+  resolveMattermostAccount,
+  type ResolvedMattermostAccount,
+} from "./mattermost/accounts.js";
+import { mattermostSetupAdapter } from "./setup-core.js";
+import { mattermostSetupWizard } from "./setup-surface.js";
+
+const mattermostMeta = {
+  id: "mattermost",
+  label: "Mattermost",
+  selectionLabel: "Mattermost (plugin)",
+  detailLabel: "Mattermost Bot",
+  docsPath: "/channels/mattermost",
+  docsLabel: "mattermost",
+  blurb: "self-hosted Slack-style chat; install the plugin to enable.",
+  systemImage: "bubble.left.and.bubble.right",
+  order: 65,
+  quickstartAllowFrom: true,
+} as const;
+
+function formatAllowEntry(entry: string): string {
+  const trimmed = entry.trim();
+  if (!trimmed) {
+    return "";
+  }
+  if (trimmed.startsWith("@")) {
+    const username = trimmed.slice(1).trim();
+    return username ? `@${username.toLowerCase()}` : "";
+  }
+  return trimmed.replace(/^(mattermost|user):/i, "").toLowerCase();
+}
+
+const mattermostConfigAdapter = createScopedChannelConfigAdapter<ResolvedMattermostAccount>({
+  sectionKey: "mattermost",
+  listAccountIds: listMattermostAccountIds,
+  resolveAccount: adaptScopedAccountAccessor(resolveMattermostAccount),
+  defaultAccountId: resolveDefaultMattermostAccountId,
+  clearBaseFields: ["botToken", "baseUrl", "name"],
+  resolveAllowFrom: (account) => account.config.allowFrom,
+  formatAllowFrom: (allowFrom) =>
+    formatNormalizedAllowFromEntries({
+      allowFrom,
+      normalizeEntry: formatAllowEntry,
+    }),
+});
+
+export const mattermostSetupPlugin: ChannelPlugin<ResolvedMattermostAccount> = {
+  id: "mattermost",
+  meta: {
+    ...mattermostMeta,
+  },
+  capabilities: {
+    chatTypes: ["direct", "channel", "group", "thread"],
+    reactions: true,
+    threads: true,
+    media: true,
+    nativeCommands: true,
+  },
+  reload: { configPrefixes: ["channels.mattermost"] },
+  configSchema: MattermostChannelConfigSchema,
+  config: {
+    ...mattermostConfigAdapter,
+    isConfigured: (account) => Boolean(account.botToken && account.baseUrl),
+    describeAccount: (account) =>
+      describeAccountSnapshot({
+        account,
+        configured: Boolean(account.botToken && account.baseUrl),
+        extra: {
+          botTokenSource: account.botTokenSource,
+          baseUrl: account.baseUrl,
+        },
+      }),
+  },
+  setup: mattermostSetupAdapter,
+  setupWizard: mattermostSetupWizard,
+};