feat: add modular impressum.js, replace martinsiebels.de with msbls.de

- shared/impressum.js: configurable via data-owner and data-style attrs
- Default: minimal msbls.de attribution for satire sites
- Build now copies shared/ to build output
- Caddyfile serves /shared/* globally across all domains
- Removed martinsiebels.de references from 7 KI-satire sites

build.sh

@@ -45,6 +45,11 @@ for site_dir in "$SCRIPT_DIR/sites"/*/; do
 done
 echo "  -> $count sites built"
 
-# 3. Report
-echo "[3/3] Build complete"
+# 3. Copy shared assets
+echo "[3/3] Copying shared assets..."
+cp -r "$SCRIPT_DIR/shared" "$BUILD_DIR/shared"
+echo "  -> shared/ copied"
+
+# 4. Report
+echo "[4/4] Build complete"
 echo "=== Build complete: $count sites ==="