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>

src/content.config.ts

@@ -0,0 +1,42 @@
+import { defineCollection, reference } from 'astro:content';
+import { glob } from 'astro/loaders';
+import { z } from 'astro/zod';
+
+// Shared per-locale layout:
+//   src/content/posts/<locale>/…      — posts
+//   src/content/categories/<locale>/… — categories
+// Entry `id` is always `<locale>/<slug>`. A blog post's `category` references a
+// category by that id (e.g. "de/technik" or "en/tech").
+
+// Optional `translationKey`: entries in different locales that represent the
+// same logical piece of content share one key. Used to wire up the language
+// switcher so it points at the translated URL instead of 404-ing.
+
+const posts = defineCollection({
+	loader: glob({ base: './src/content/posts', pattern: '{de,en}/**/*.{md,mdx}' }),
+	schema: ({ image }) =>
+		z.object({
+			title: z.string(),
+			description: z.string(),
+			pubDate: z.coerce.date(),
+			updatedDate: z.coerce.date().optional(),
+			heroImage: z.optional(image()),
+			category: z.optional(reference('categories')),
+			// Free-form tags (aka Stichwörter). Plain strings kept inline on each
+			// post; no separate collection. The tag listing pages aggregate them
+			// across posts per locale.
+			tags: z.array(z.string()).optional(),
+			translationKey: z.string().optional(),
+		}),
+});
+
+const categories = defineCollection({
+	loader: glob({ base: './src/content/categories', pattern: '{de,en}/**/*.md' }),
+	schema: z.object({
+		name: z.string(),
+		description: z.string().optional(),
+		translationKey: z.string().optional(),
+	}),
+});
+
+export const collections = { posts, categories };