feat(integrations): add Zapier integration for Mem0

Zapier Platform CLI app (zapier-mem0) with Add Memory / Delete Memory
creates and Search Memories / Get Memories searches against the Mem0 v3
API. Custom API-key auth (Authorization: Token), base-URL + auth
injected via beforeRequest middleware, non-2xx surfaced as errors.

Add Memory polls GET /v1/event/{id}/ for async extraction. Includes an
E2E test suite via createAppTester.

integrations/zapier-mem0/.gitignore

@@ -0,0 +1,7 @@
+node_modules/
+.env
+.zapierapprc
+build/
+coverage/
+*.log
+.DS_Store