migrate 392 questions to pattern format

backend/data/questions/cat-and-mouse-ii.yaml

@@ -7,9 +7,12 @@ categories:
   - graphs
   - dynamic-programming
 patterns:
-  - bfs
-  - dynamic-programming
-  - matrix-traversal
+  - slug: bfs
+    is_optimal: true
+  - slug: dynamic-programming
+    is_optimal: false
+  - slug: matrix-traversal
+    is_optimal: false
 
 function_signature: "def can_mouse_win(grid: list[str], cat_jump: int, mouse_jump: int) -> bool:"