chore: fix vitest standalone configs and update package description (#11865)

* chore: fix vitest standalone configs and update package description

- vitest.live.config.ts and vitest.e2e.config.ts now extend root config
- Inherits testTimeout (120s), resolve.alias, pool, setupFiles, excludes
- ui/vitest.node.config.ts gets explicit 120s timeout
- package.json description updated for multi-channel AI gateway
- Removed unused src/utils/time-format.ts

* chore: filter inherited excludes in live/e2e vitest configs

* refactor: dedupe GroupPolicy/DmPolicy in extensions

Import from openclaw/plugin-sdk instead of re-declaring identical types.

package.json

@@ -1,7 +1,7 @@
 {
   "name": "openclaw",
   "version": "2026.2.6-3",
-  "description": "WhatsApp gateway CLI (Baileys web) with Pi RPC agent",
+  "description": "Multi-channel AI gateway with extensible messaging integrations",
   "keywords": [],
   "license": "MIT",
   "author": "",