Milestone 0: import zappier billing, Verae middleware, and Zapier research

Compose-ready workspace: packages/zappier (rate card, portal, Stripe),
packages/verae-zapier-middleware (timestamp + NATS), packages/verae-zapier
(CLI app), vendor/zapier-platform, and research/zapier vendor corpus.

Gate 0 structure checks pass. Product code and research are not yet wired.

vendor/zapier-platform/example-apps/openai/creates/index.js

@@ -0,0 +1,7 @@
+/* eslint-disable camelcase */
+const chat_completion = require('./chat_completion');
+
+// If you add a new create, make sure it is exported here to display in the Zapier Editor
+module.exports = {
+  [chat_completion.key]: chat_completion,
+};