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/qs/eslint.config.mjs

@@ -0,0 +1,56 @@
+import ljharbConfig from '@ljharb/eslint-config/flat';
+
+export default [
+    {
+        ignores: ['dist/'],
+    },
+
+    ...ljharbConfig,
+
+    {
+        rules: {
+            complexity: 'off',
+            'consistent-return': 'warn',
+            'func-name-matching': 'off',
+            'id-length': [
+                'error',
+                {
+                    max: 25,
+                    min: 1,
+                    properties: 'never',
+                },
+            ],
+            indent: ['error', 4],
+            'max-lines': 'off',
+            'max-lines-per-function': [
+                'error',
+                { max: 150 },
+            ],
+            'max-params': ['error', 18],
+            'max-statements': ['error', 100],
+            'multiline-comment-style': 'off',
+            'no-continue': 'warn',
+            'no-magic-numbers': 'off',
+            'no-restricted-syntax': [
+                'error',
+                'BreakStatement',
+                'DebuggerStatement',
+                'ForInStatement',
+                'LabeledStatement',
+                'WithStatement',
+            ],
+        },
+    },
+
+    {
+        files: ['test/**'],
+        rules: {
+            'function-paren-newline': 'off',
+            'max-lines-per-function': 'off',
+            'max-statements': 'off',
+            'no-buffer-constructor': 'off',
+            'no-extend-native': 'off',
+            'no-throw-literal': 'off',
+        },
+    },
+];