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/postcss/lib/fromJSON.js

@@ -0,0 +1,54 @@
+'use strict'
+
+let AtRule = require('./at-rule')
+let Comment = require('./comment')
+let Declaration = require('./declaration')
+let Input = require('./input')
+let PreviousMap = require('./previous-map')
+let Root = require('./root')
+let Rule = require('./rule')
+
+function fromJSON(json, inputs) {
+  if (Array.isArray(json)) return json.map(n => fromJSON(n))
+
+  let { inputs: ownInputs, ...defaults } = json
+  if (ownInputs) {
+    inputs = []
+    for (let input of ownInputs) {
+      let inputHydrated = { ...input, __proto__: Input.prototype }
+      if (inputHydrated.map) {
+        inputHydrated.map = {
+          ...inputHydrated.map,
+          __proto__: PreviousMap.prototype
+        }
+      }
+      inputs.push(inputHydrated)
+    }
+  }
+  if (defaults.nodes) {
+    defaults.nodes = json.nodes.map(n => fromJSON(n, inputs))
+  }
+  if (defaults.source) {
+    let { inputId, ...source } = defaults.source
+    defaults.source = source
+    if (inputId != null) {
+      defaults.source.input = inputs[inputId]
+    }
+  }
+  if (defaults.type === 'root') {
+    return new Root(defaults)
+  } else if (defaults.type === 'decl') {
+    return new Declaration(defaults)
+  } else if (defaults.type === 'rule') {
+    return new Rule(defaults)
+  } else if (defaults.type === 'comment') {
+    return new Comment(defaults)
+  } else if (defaults.type === 'atrule') {
+    return new AtRule(defaults)
+  } else {
+    throw new Error('Unknown node type: ' + json.type)
+  }
+}
+
+module.exports = fromJSON
+fromJSON.default = fromJSON