v1.0.0 - Release: widget area, documentation refresh

- Register sidebar widget area via register_sidebar()
- Render WordPress widgets in Twig sidebar with fallback to built-in content
- Update README.md with accurate feature counts and descriptions
- Update translation files with widget area strings
- Bump version to 1.0.0

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

languages/de_CH.po

@@ -906,6 +906,14 @@ msgstr "Hauptnavigation"
 msgid "Footer navigation"
 msgstr "Fussnavigation"
 
+#: functions.php
+msgid "Sidebar"
+msgstr "Seitenleiste"
+
+#: functions.php
+msgid "Add widgets here to appear in the sidebar."
+msgstr "Widgets hier hinzufuegen, um sie in der Seitenleiste anzuzeigen."
+
 #: views/partials/sidebar.html.twig
 msgid "Blog sidebar"
 msgstr "Blog-Seitenleiste"