Add Milestones 1 & 2: full-stack POS foundation with admin UI

- Node/Express/TypeScript API under /api/v1 with JWT auth (login, refresh, logout, /me)
- Prisma schema: vendors, users, roles, products, categories, taxes, transactions
- SQLite for local dev; Postgres via docker-compose for production
- Full CRUD routes for vendors, users, categories, taxes, products with Zod validation and RBAC
- Paginated list endpoints scoped per vendor; refresh token rotation
- React/TypeScript admin SPA (Vite): login, protected routing, sidebar layout
- Pages: Dashboard, Catalog (tabbed Products/Categories/Taxes), Users, Vendor Settings
- Shared UI: Table, Modal, FormField, Btn, PageHeader components
- Multi-stage Dockerfile; docker-compose with Postgres healthcheck
- Seed script with demo vendor and owner account
- INSTRUCTIONS.md, ROADMAP.md, .claude/launch.json for dev server config

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server/src/index.ts

@@ -0,0 +1,35 @@
+import "dotenv/config";
+import { createApp } from "./app.js";
+import { prisma } from "./lib/prisma.js";
+
+const PORT = Number(process.env.PORT ?? 8080);
+
+async function main() {
+  // Verify DB connectivity on startup
+  try {
+    await prisma.$connect();
+    console.log("Database connected");
+  } catch (err) {
+    console.error("Failed to connect to database:", err);
+    process.exit(1);
+  }
+
+  const app = createApp();
+
+  const server = app.listen(PORT, () => {
+    console.log(`POS API running on port ${PORT} [${process.env.NODE_ENV ?? "development"}]`);
+  });
+
+  const shutdown = async () => {
+    console.log("Shutting down...");
+    server.close(async () => {
+      await prisma.$disconnect();
+      process.exit(0);
+    });
+  };
+
+  process.on("SIGTERM", shutdown);
+  process.on("SIGINT", shutdown);
+}
+
+main();