v2.2: Verkaufsfertig-Fundament — Mollie/Payment-Abstraktion, MwSt/Grundpreis (PAngV), Versandzonen, Bestellmails (Listmonk/SMTP/Log), Feature-Flags

- payments.js: einheitliche createPayment/Webhook-Schnittstelle (Mollie Default, Stripe, Demo); Auto-Provider-Wahl; Mollie-REST + /api/payments/webhook (idempotent); Fake-Key => sauberer Demo-Fallback
- mailer.js: sendMail via Listmonk-Tx / SMTP (nodemailer) / Log-Fallback (email_log); gebrandete Bestellbestaetigung bei paid
- DACH: products.mwst + base_amount/base_unit/base_price_per (Grundpreis); Storefront/Warenkorb/Checkout/Erfolg/Admin mit MwSt-Ausweis + Versand-Transparenz; tax_cents/shipping_cents/country an Orders
- shipping_zones-Tabelle + CRUD + shippingFor(); Admin 'Versand'; serverseitige Versandberechnung in /api/checkout + /api/shipping-quote (Laenderwahl live)
- Feature-Flags (feature_*) + feature()-Helper; Admin Module-Toggles; Newsletter-Gating (Popup/Subscribe)
- Admin-API/Manifest/ai-admin.txt um shipping_zones erweitert; MCP list/upsert/delete_shipping; README/.env.example ergaenzt; Version 2.2.0

package.json

@@ -1,7 +1,7 @@
 {
   "name": "hd-commerce",
   "type": "module",
-  "version": "2.1.0",
+  "version": "2.2.0",
   "private": true,
   "description": "hd-commerce — neutrales SQLite-Commerce-Backend (Admin + API + Demo-Storefront)",
   "scripts": {
@@ -11,11 +11,12 @@
     "prebuild": "node ./scripts/sync-css.mjs"
   },
   "dependencies": {
-    "astro": "^5.6.0",
     "@astrojs/node": "^9.1.3",
-    "better-sqlite3": "^11.8.1",
-    "stripe": "^17.5.0",
     "@fontsource-variable/fraunces": "^5.1.0",
-    "@fontsource-variable/public-sans": "^5.1.0"
+    "@fontsource-variable/public-sans": "^5.1.0",
+    "astro": "^5.6.0",
+    "better-sqlite3": "^11.8.1",
+    "nodemailer": "^6.10.1",
+    "stripe": "^17.5.0"
   }
 }