Fix import error in commentary route

Change `from .. import bible` to `from ..kjv import bible` to match
the correct import pattern used throughout the codebase.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

kjvstudy_org/routes/commentary.py

@@ -64,8 +64,8 @@ async def commentary_index(request: Request):
     ]
 
     # Get books list for navigation
-    from ..kjv import get_books
-    books = get_books()
+    from ..kjv import bible
+    books = bible.get_books()
 
     return templates.TemplateResponse(
         "commentary_index.html",