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/node_modules/tsx/README.md

@@ -0,0 +1,32 @@
+<h1 align="center">
+<br>
+<picture>
+	<source media="(prefers-color-scheme: dark)" srcset=".github/logo-dark.svg">
+	<img width="160" alt="tsx" src=".github/logo-light.svg">
+</picture>
+<br><br>
+<a href="https://npm.im/tsx"><img src="https://badgen.net/npm/v/tsx"></a> <a href="https://npm.im/tsx"><img src="https://badgen.net/npm/dm/tsx"></a>
+</h1>
+
+<p align="center">
+TypeScript Execute (tsx): The easiest way to run TypeScript in Node.js
+<br><br>
+<a href="https://tsx.is">Documentation</a>&nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp;<a href="https://tsx.is/getting-started">Getting started →</a>
+</p>
+
+<br>
+
+<p align="center">
+	<a href="https://github.com/sponsors/privatenumber/sponsorships?tier_id=398771"><img width="412" src="https://raw.githubusercontent.com/privatenumber/sponsors/master/banners/assets/donate.webp"></a>
+	<a href="https://github.com/sponsors/privatenumber/sponsorships?tier_id=416984"><img width="412" src="https://raw.githubusercontent.com/privatenumber/sponsors/master/banners/assets/sponsor.webp"></a>
+</p>
+<p align="center"><sup><i>Already a sponsor?</i> Join the discussion in the <a href="https://github.com/pvtnbr/tsx">Development repo</a>!</sup></p>
+
+## Sponsors
+
+<p align="center">
+	<a href="https://github.com/sponsors/privatenumber">
+		<img src="https://cdn.jsdelivr.net/gh/privatenumber/sponsors/sponsorkit/sponsors.svg">
+	</a>
+</p>
+