Initial Astro + Tailwind scaffold for Wohlruf landing page

- Astro static site generator with zero-JS default output
- Tailwind CSS for styling (consistent with main app stack)
- German-language landing page: hero, how-it-works, features, pricing, FAQ, CTA
- Placeholder pages for Impressum, Datenschutz, AGB
- Reusable Header/Footer/Base layout components
- FTP-deployable static output via `npm run build`
- README with content TODO list for CMO

Co-Authored-By: Paperclip <noreply@paperclip.ing>

package.json

@@ -0,0 +1,20 @@
+{
+  "name": "wohlruf-website",
+  "type": "module",
+  "version": "0.1.0",
+  "description": "Wohlruf — KI-Sprachbegleiter für Senioren. Marketing landing page.",
+  "engines": {
+    "node": ">=22.12.0"
+  },
+  "scripts": {
+    "dev": "astro dev",
+    "build": "astro build",
+    "preview": "astro preview",
+    "astro": "astro"
+  },
+  "dependencies": {
+    "@astrojs/tailwind": "^5.1.3",
+    "astro": "^6.1.3",
+    "tailwindcss": "^3.4.17"
+  }
+}