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/README.md

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+# zappier-sales-pricing
+
+Sales-department API for **per-customer pricing** (tier + `multiplierOverride`). zappier-edge remains the rate-card store.
+
+**Forgejo:** https://git.georgelambert.org/marchon/zappier-sales-pricing  
+**Catalog:** https://zapier.georgelambert.org/packages/zappier-sales-pricing/README.pdf
+
+```bash
+PORT=3012 node src/server.js
+curl http://127.0.0.1:3012/quotes/cust_2
+curl -X PUT http://127.0.0.1:3012/customers/cust_2/pricing \
+  -H 'content-type: application/json' \
+  -d '{"multiplierOverride":0.4,"tierId":"business"}'
+```

packages/zappier-sales-pricing/package.json

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+{
+  "name": "zappier-sales-pricing",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "description": "Sales-department per-customer pricing; writes multiplier/tier on zappier-edge",
+  "scripts": {
+    "start": "node src/server.js",
+    "test": "node --test test/*.test.js"
+  }
+}

packages/zappier-sales-pricing/src/server.js

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+#!/usr/bin/env node
+/** Sales department: per-customer multiplier / tier. Writes through zappier-edge. */
+import http from 'node:http';
+
+const PORT = Number(process.env.PORT || 3012);
+const EDGE = (process.env.ZAPPIER_ADMIN_URL || 'http://127.0.0.1:3000').replace(/\/$/, '');
+const KEY = process.env.ZAPPIER_ADMIN_KEY || 'admin-dev-key';
+
+async function edge(pathname, { method = 'GET', body } = {}) {
+  const r = await fetch(`${EDGE}${pathname}`, {
+    method,
+    headers: { 'content-type': 'application/json', 'x-admin-key': KEY },
+    body: body ? JSON.stringify(body) : undefined,
+  });
+  const text = await r.text();
+  try {
+    return { status: r.status, body: JSON.parse(text) };
+  } catch {
+    return { status: r.status, body: text };
+  }
+}
+
+const server = http.createServer(async (req, res) => {
+  const url = new URL(req.url || '/', `http://127.0.0.1:${PORT}`);
+  const json = (code, obj) => {
+    res.writeHead(code, { 'content-type': 'application/json' });
+    res.end(JSON.stringify(obj));
+  };
+  try {
+    if (req.method === 'GET' && url.pathname === '/health') {
+      return json(200, { ok: true, role: 'zappier-sales-pricing' });
+    }
+    const quote = url.pathname.match(/^\/quotes\/([^/]+)$/);
+    if (req.method === 'GET' && quote) {
+      const forwarded = await edge(`/admin/api/sales/quote/${quote[1]}`);
+      return json(forwarded.status, forwarded.body);
+    }
+    const price = url.pathname.match(/^\/customers\/([^/]+)\/pricing$/);
+    if (req.method === 'PUT' && price) {
+      const chunks = [];
+      for await (const c of req) chunks.push(c);
+      const payload = JSON.parse(Buffer.concat(chunks).toString('utf8') || '{}');
+      const forwarded = await edge(`/admin/api/customers/${price[1]}`, { method: 'PUT', body: payload });
+      return json(forwarded.status, forwarded.body);
+    }
+    json(404, { error: 'not found' });
+  } catch (err) {
+    json(502, { error: err.message });
+  }
+});
+
+server.listen(PORT, '0.0.0.0', () => {
+  process.stdout.write(`zappier-sales-pricing http://127.0.0.1:${PORT}/\n`);
+});

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

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+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');
+  }
+});