Add NATS account-balance SoT and statement review for customers, CS, and sales

Internal billing now uses verae.billing.* request-reply and pubs. zappier-account-balance tracks prepaid, credits, usage, and payments. Portal, admin, CS, and sales all review the same statement. Independent Forgejo repos stay split via push-module-repos.

packages/zappier/src/admin.ts

@@ -12,6 +12,8 @@ import { billingRows, toCsv, usageTrend } from './reports';
 import { UsageRepo } from './usage';
 import { CreditLedger } from './credits';
 import { invoicesToAccountingCsv, invoicesToQuickBooksIif } from './accounting-export';
+import { composeStatement } from './statement';
+import { BILLING_SUBJECTS, natsAdjust, natsPublish, natsStatement } from './billing-nats';
 
 // Issued login tokens (in-memory; a restart simply requires logging in again).
 const sessions = new Map<string, number>();
@@ -246,6 +248,14 @@ export function adminRouter(
       agent: typeof agent === 'string' ? agent : 'admin',
     });
     customers.save({ ...customer, balanceCents: (customer.balanceCents ?? 0) + delta });
+    natsPublish(BILLING_SUBJECTS.CREDIT_APPLIED, rec);
+    void natsAdjust({
+      customerId,
+      cents: delta,
+      reason: rec.reason,
+      agent: rec.agent,
+      kind: 'credit',
+    });
     res.status(201).json(rec);
   });
 
@@ -254,6 +264,31 @@ export function adminRouter(
     res.json({ credits: credits.list(customerId) });
   });
 
+  router.get('/statement/:id', async (req, res) => {
+    const customer = customers.list().find((c) => c.id === req.params.id);
+    if (!customer) {
+      res.status(404).json({ error: 'customer not found' });
+      return;
+    }
+    const fromNats = await natsStatement(customer.id);
+    if (fromNats) {
+      res.json({ ...fromNats, name: customer.name, tierId: customer.tierId, source: 'nats' });
+      return;
+    }
+    res.json({
+      ...composeStatement({
+        customerId: customer.id,
+        prepaidCents: customer.balanceCents ?? 0,
+        credits: credits.list(customer.id),
+        usage: accounting.usage.listFor(customer.id),
+        invoices: accounting.invoices.list({ customerId: customer.id }),
+      }),
+      name: customer.name,
+      tierId: customer.tierId,
+      source: 'local',
+    });
+  });
+
   router.get('/sales/quote/:id', (req, res) => {
     const customer = customers.list().find((c) => c.id === req.params.id);
     if (!customer) {