add multi-currency master CRUD (Phase 2)

- add currencyadapter.js: list (with pagination+keyword), detail, history, create, update (auto-log rate change to tbl_currency_log), delete (soft), convertAmount helper
- add controllers/currency.js and routes/currency.js, auto-mounted at /currency
- update dbproc.js: configurable port via HOSTPORT env variable

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

routes/currency.js

@@ -0,0 +1,13 @@
+const express = require('express');
+const currencycontroller = require('../controllers/currency');
+const jwtauth = require('../middlewares/auth.js');
+const router = express.Router();
+
+router.get('/list', [jwtauth], currencycontroller.getCurrencyList);
+router.get('/detail/:id', [jwtauth], currencycontroller.getCurrencyDetail);
+router.get('/history/:id', [jwtauth], currencycontroller.getCurrencyHistory);
+router.post('/create', [jwtauth], currencycontroller.createCurrency);
+router.put('/update/:id', [jwtauth], currencycontroller.updateCurrency);
+router.delete('/delete/:id', [jwtauth], currencycontroller.deleteCurrency);
+
+module.exports = router;