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.

packages/zappier/openapi.yaml

@@ -0,0 +1,73 @@
+openapi: 3.0.3
+info:
+  title: Zappier API
+  version: 0.1.0
+  description: Metered data API. Every priced call returns its quote.
+security:
+  - apiKey: []
+paths:
+  /v1/status:
+    get:
+      operationId: status
+      summary: Service status (free)
+      responses:
+        '200':
+          description: OK
+  /v1/transform:
+    post:
+      operationId: transform
+      summary: Uppercase a string (fixed price)
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              type: object
+              required: [text]
+              properties:
+                text:
+                  type: string
+      responses:
+        '200':
+          description: OK
+  /v1/storage:
+    post:
+      operationId: storage
+      summary: Store metadata and file attachments (variable price by size)
+      requestBody:
+        required: true
+        content:
+          multipart/form-data:
+            schema:
+              type: object
+              properties:
+                metadata:
+                  type: string
+                  description: JSON string of metadata
+                attachments:
+                  type: array
+                  items:
+                    type: string
+                    format: binary
+      responses:
+        '200':
+          description: OK
+    get:
+      operationId: storage-list
+      summary: List your stored items (free)
+      responses:
+        '200':
+          description: OK
+  /v1/usage:
+    get:
+      operationId: usage
+      summary: Your usage summary for the current period
+      responses:
+        '200':
+          description: OK
+components:
+  securitySchemes:
+    apiKey:
+      type: apiKey
+      in: header
+      name: x-api-key