perf: trim slack extension test setup

test/vitest/vitest.extension-slack.config.ts

@@ -1,9 +1,16 @@
-import { createSingleChannelExtensionVitestConfig } from "./vitest.extension-channel-single-config.ts";
+import { createScopedVitestConfig } from "./vitest.scoped-config.ts";
 
 export function createExtensionSlackVitestConfig(
   env: Record<string, string | undefined> = process.env,
 ) {
-  return createSingleChannelExtensionVitestConfig("slack", env);
+  return createScopedVitestConfig(["extensions/slack/**/*.test.ts"], {
+    dir: "extensions",
+    env,
+    includeOpenClawRuntimeSetup: false,
+    name: "extension-slack",
+    passWithNoTests: true,
+    setupFiles: ["test/setup.extensions.ts"],
+  });
 }
 
 export default createExtensionSlackVitestConfig();