Fix blog page title showing post name twice

Stop concatenating post title into base_title in route context.
Build proper "Post Title — Site Title" format in meta component instead.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

blog/bp/blog/routes.py

@@ -125,7 +125,7 @@ def register(url_prefix, title):
 
       ctx = {
           **p_data,
-          "base_title": f"{get_config()['title']} {p_data['post']['title']}",
+          "base_title": get_config()["title"],
           "container_nav_html": container_nav_html,
       }
 

blog/bp/post/routes.py

@@ -78,7 +78,7 @@ def register():
 
           ctx = {
               **p_data,
-              "base_title": f"{config()['title']} {p_data['post']['title']}",
+              "base_title": config()["title"],
               "container_nav_html": container_nav_html,
           }