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>

Containerfile

@@ -0,0 +1,35 @@
+FROM node:22-bookworm-slim AS build
+
+ARG WEBMENTION_TOKEN=""
+ENV WEBMENTION_TOKEN=$WEBMENTION_TOKEN
+
+WORKDIR /app
+
+COPY package.json package-lock.json ./
+
+RUN npm ci
+
+COPY . .
+
+RUN npm run build
+
+
+FROM node:22-bookworm-slim AS runtime
+
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV ASTRO_TELEMETRY_DISABLED=1
+ENV HOST=0.0.0.0
+ENV PORT=4321
+
+COPY --from=build --chown=node:node /app/package.json ./package.json
+COPY --from=build --chown=node:node /app/package-lock.json ./package-lock.json
+COPY --from=build --chown=node:node /app/node_modules ./node_modules
+COPY --from=build --chown=node:node /app/dist ./dist
+
+USER node
+
+EXPOSE 4321
+
+CMD ["node", "dist/server/entry.mjs"]