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/line-items/index.js

@@ -0,0 +1,12 @@
+const order = require('./creates/order');
+
+const App = {
+  version: require('./package.json').version,
+  platformVersion: require('zapier-platform-core').version,
+
+  creates: {
+    [order.key]: order,
+  },
+};
+
+module.exports = App;