Add Ladill POS v1 — register, Pay checkout, and commerce links.

Staff-facing counter register at pos.ladill.com with catalog cart, cash and
MoMo/card checkout via Ladill Pay, CRM timeline/import, invoice prefill, and
Merchant catalog import.

Co-authored-by: Cursor <cursoragent@cursor.com>

README.md

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+# Ladill POS
+
+In-store register at **pos.ladill.com** — product grid, cart, cash or Ladill Pay checkout.
+
+## Features (v1)
+
+- **Register** — catalog + quick-amount sales
+- **Products** — local catalog CRUD
+- **Sales** — history and receipt view
+- **Ladill Pay** — MoMo/card via `source_service: pos`, `fee_tier: sales`
+
+## Local dev
+
+```bash
+cp .env.example .env
+composer install
+php artisan key:generate
+touch database/database.sqlite
+# set DB_CONNECTION=sqlite in .env
+php artisan migrate
+npm install && npm run build
+php artisan serve
+```
+
+## Tests
+
+```bash
+php artisan test
+```
+
+## Deploy
+
+See [DEPLOY.md](DEPLOY.md).
+
+## Roadmap
+
+- CRM timeline + product import
+- Invoice receipt prefill
+- Merchant catalog import