fix(site): export preview/download and restore GeoExport deploy

Restore site/ mirror, patch export fetch for empty API responses and
Keenetic format, add Telegram bot card, and switch install.sh back to
geoexport-site systemd + nginx on port 4173.

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

site/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "geoexport-clone",
+  "private": true,
+  "version": "1.0.0",
+  "description": "Local mirror of https://geoexport.org/",
+  "scripts": {
+    "start": "node server.mjs",
+    "dev": "node server.mjs",
+    "patch": "node patch-bundle.mjs",
+    "prestart": "node patch-bundle.mjs"
+  },
+  "engines": {
+    "node": ">=18"
+  }
+}