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>

client/node_modules/browserslist/browser.js

@@ -0,0 +1,54 @@
+var BrowserslistError = require('./error')
+
+function noop() {}
+
+module.exports = {
+  loadQueries: function loadQueries() {
+    throw new BrowserslistError(
+      'Sharable configs are not supported in client-side build of Browserslist'
+    )
+  },
+
+  getStat: function getStat(opts) {
+    return opts.stats
+  },
+
+  loadConfig: function loadConfig(opts) {
+    if (opts.config) {
+      throw new BrowserslistError(
+        'Browserslist config are not supported in client-side build'
+      )
+    }
+  },
+
+  loadCountry: function loadCountry() {
+    throw new BrowserslistError(
+      'Country statistics are not supported ' +
+        'in client-side build of Browserslist'
+    )
+  },
+
+  loadFeature: function loadFeature() {
+    throw new BrowserslistError(
+      'Supports queries are not available in client-side build of Browserslist'
+    )
+  },
+
+  currentNode: function currentNode(resolve, context) {
+    return resolve(['maintained node versions'], context)[0]
+  },
+
+  parseConfig: noop,
+
+  readConfig: noop,
+
+  findConfig: noop,
+
+  findConfigFile: noop,
+
+  clearCaches: noop,
+
+  oldDataWarning: noop,
+
+  env: {}
+}