fix: Docker multi-stage build for sqlite3, health endpoint, productValidator exports

- Dockerfile: multi-stage build (builder with python3+g++ for native addons)
- Dockerfile: wireguard-tools from edge/community repo
- Dockerfile: removed USER appuser (start.sh needs root for wg-quick)
- Dockerfile: health check on port 3000
- Added /health HTTP endpoint in index.js for Docker healthcheck
- Fixed productValidator.js: added named exports (validateProductName, validateProductPrice)
- Added better-sqlite3 as fallback dependency

src/handlers/adminHandlers/product/productValidator.js

@@ -1,7 +1,23 @@
 import Validators from '../../../utils/validators.js';
+import logger from '../../../utils/logger.js';
+
+export function validateProductName(name, chatId) {
+    if (!Validators.isValidString(name, 255)) {
+        logger.warn({ chatId, name }, 'Invalid product name');
+        return false;
+    }
+    return true;
+}
+
+export function validateProductPrice(price, chatId) {
+    if (!Validators.isValidPrice(price)) {
+        logger.warn({ chatId, price }, 'Invalid product price');
+        return false;
+    }
+    return true;
+}
 
 export default class ProductValidator {
-
     static validateProduct(product) {
         if (!Validators.isValidString(product.name, 255)) {
             return `Ошибка: недопустимое название товара "${product.name}"`;
@@ -14,4 +30,4 @@ export default class ProductValidator {
         }
         return null;
     }
-}
+}