migrate 392 questions to pattern format

backend/data/questions/check-if-two-string-arrays-are-equivalent.yaml

@@ -7,7 +7,8 @@ categories:
   - arrays
   - strings
 patterns:
-  - two-pointers
+  - slug: two-pointers
+    is_optimal: true
 
 function_signature: "def array_strings_are_equal(word1: list[str], word2: list[str]) -> bool:"