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/nanoid/index.d.ts

@@ -0,0 +1,91 @@
+/**
+ * Generate secure URL-friendly unique ID.
+ *
+ * By default, the ID will have 21 symbols to have a collision probability
+ * similar to UUID v4.
+ *
+ * ```js
+ * import { nanoid } from 'nanoid'
+ * model.id = nanoid() //=> "Uakgb_J5m9g-0JDMbcJqL"
+ * ```
+ *
+ * @param size Size of the ID. The default size is 21.
+ * @returns A random string.
+ */
+export function nanoid(size?: number): string
+
+/**
+ * Generate secure unique ID with custom alphabet.
+ *
+ * Alphabet must contain 256 symbols or less. Otherwise, the generator
+ * will not be secure.
+ *
+ * @param alphabet Alphabet used to generate the ID.
+ * @param defaultSize Size of the ID. The default size is 21.
+ * @returns A random string generator.
+ *
+ * ```js
+ * const { customAlphabet } = require('nanoid')
+ * const nanoid = customAlphabet('0123456789абвгдеё', 5)
+ * nanoid() //=> "8ё56а"
+ * ```
+ */
+export function customAlphabet(
+  alphabet: string,
+  defaultSize?: number
+): (size?: number) => string
+
+/**
+ * Generate unique ID with custom random generator and alphabet.
+ *
+ * Alphabet must contain 256 symbols or less. Otherwise, the generator
+ * will not be secure.
+ *
+ * ```js
+ * import { customRandom } from 'nanoid/format'
+ *
+ * const nanoid = customRandom('abcdef', 5, size => {
+ *   const random = []
+ *   for (let i = 0; i < size; i++) {
+ *     random.push(randomByte())
+ *   }
+ *   return random
+ * })
+ *
+ * nanoid() //=> "fbaef"
+ * ```
+ *
+ * @param alphabet Alphabet used to generate a random string.
+ * @param size Size of the random string.
+ * @param random A random bytes generator.
+ * @returns A random string generator.
+ */
+export function customRandom(
+  alphabet: string,
+  size: number,
+  random: (bytes: number) => Uint8Array
+): () => string
+
+/**
+ * URL safe symbols.
+ *
+ * ```js
+ * import { urlAlphabet } from 'nanoid'
+ * const nanoid = customAlphabet(urlAlphabet, 10)
+ * nanoid() //=> "Uakgb_J5m9"
+ * ```
+ */
+export const urlAlphabet: string
+
+/**
+ * Generate an array of random bytes collected from hardware noise.
+ *
+ * ```js
+ * import { customRandom, random } from 'nanoid'
+ * const nanoid = customRandom("abcdef", 5, random)
+ * ```
+ *
+ * @param bytes Size of the array.
+ * @returns An array of random bytes.
+ */
+export function random(bytes: number): Uint8Array