Initial commit: Astro 6 static blog site

- German (default) and English i18n support
- Categories and tags
- Blog posts with hero images
- Dark/light theme switcher
- View Transitions removed to fix reload ghost images
- Webmentions integration
- RSS feeds per locale

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.claude/launch.json

@@ -0,0 +1,11 @@
+{
+	"version": "0.0.1",
+	"configurations": [
+		{
+			"name": "astro-dev",
+			"runtimeExecutable": "npm",
+			"runtimeArgs": ["run", "dev"],
+			"port": 4321
+		}
+	]
+}