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

package-lock.json

@@ -10,6 +10,7 @@
       "dependencies": {
         "archiver": "^7.0.1",
         "axios": "^1.7.7",
+        "better-sqlite3": "^11.10.0",
         "bip39": "^3.1.0",
         "bitcoinjs-lib": "^6.1.6",
         "csv-writer": "^1.6.0",
@@ -750,6 +751,17 @@
       "resolved": "https://registry.npmjs.org/bech32/-/bech32-2.0.0.tgz",
       "integrity": "sha512-LcknSilhIGatDAsY1ak2I8VtGaHNhgMSYVxFrGLXv+xLHytaKZKcaUJJUE7qmBr7h33o5YQwP55pMI0xmkpJwg=="
     },
+    "node_modules/better-sqlite3": {
+      "version": "11.10.0",
+      "resolved": "https://registry.npmjs.org/better-sqlite3/-/better-sqlite3-11.10.0.tgz",
+      "integrity": "sha512-EwhOpyXiOEL/lKzHz9AW1msWFNzGc/z+LzeB3/jnFJpxu+th2yqvzsSWas1v9jgs9+xiXJcD5A8CJxAG2TaghQ==",
+      "hasInstallScript": true,
+      "license": "MIT",
+      "dependencies": {
+        "bindings": "^1.5.0",
+        "prebuild-install": "^7.1.1"
+      }
+    },
     "node_modules/binary-extensions": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.3.0.tgz",