Wire zappier-edge into the live stack and add billing department APIs

Fleet now spawns the real zappier and middleware processes. Metered
timestamp/receipt/hash calls proxy to middleware when ZAPPIER_UPSTREAM
is set. CS credits, sales per-customer pricing, and QuickBooks export
are separate repos plugged into zappier-edge admin.

packages/zappier-sales-pricing/test/health.test.js

@@ -0,0 +1,23 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { spawn } from 'node:child_process';
+import { fileURLToPath } from 'node:url';
+import path from 'node:path';
+
+const root = path.join(path.dirname(fileURLToPath(import.meta.url)), '..');
+
+test('sales-pricing health', async () => {
+  const port = 18012;
+  const child = spawn(process.execPath, ['src/server.js'], {
+    cwd: root,
+    env: { ...process.env, PORT: String(port) },
+    stdio: ['ignore', 'pipe', 'pipe'],
+  });
+  await new Promise((r) => setTimeout(r, 400));
+  try {
+    const r = await fetch(`http://127.0.0.1:${port}/health`);
+    assert.equal((await r.json()).role, 'zappier-sales-pricing');
+  } finally {
+    child.kill('SIGTERM');
+  }
+});