fix(bot): remove redundant deposit amount step, add Visa/MC label, Mercuryo auth note, enforce product completeness

- Remove deposit amount-selection step; deposit_wallet_<TYPE> now routes directly to instruction
- Add VISA / Mastercard text to Mercuryo card button (i18n en/es/de)
- Add deposit_important5: Mercuryo 1-payment-without-auth + top-up-reserve warning
- Admin validation: description + photo required on product create/update (products.js, catalogProducts.js)
- Cleanup orphan uploaded files on validation failure (catalogProducts.js)
- Bot guards: fallback to products.no_description / products.no_photo for incomplete products
- Add vitest + 7 purchase edge-case tests (src/__tests__/userProductHandler.test.js)
- Bump version to v1.2.1

package.json

@@ -3,6 +3,8 @@
   "version": "1.0.0",
   "type": "module",
   "scripts": {
+    "test": "vitest run",
+    "test:watch": "vitest",
     "start": "node src/index.js",
     "dev": "nodemon src/index.js"
   },
@@ -31,6 +33,7 @@
   },
   "devDependencies": {
     "nodemon": "^3.0.2",
-    "playwright": "^1.61.1"
+    "playwright": "^1.61.1",
+    "vitest": "^2.1.9"
   }
 }