Fix: Set special=true for thinking tokens and add to additional_special_tokens

tokenizer_config.json

@@ -174,7 +174,7 @@
       "normalized": false,
       "rstrip": false,
       "single_word": false,
-      "special": false
+      "special": true
     },
     "151351": {
       "content": "</think>",
@@ -182,7 +182,7 @@
       "normalized": false,
       "rstrip": false,
       "single_word": false,
-      "special": false
+      "special": true
     },
     "151352": {
       "content": "<tool_call>",
@@ -311,7 +311,8 @@
     "<|code_prefix|>",
     "<|code_middle|>",
     "<|code_suffix|>",
-    "/nothink"
+    "<think>",
+    "</think>"
   ],
   "clean_up_tokenization_spaces": false,
   "do_lower_case": false,
@@ -322,4 +323,4 @@
   "padding_side": "left",
   "remove_space": false,
   "tokenizer_class": "PreTrainedTokenizerFast"
-}
+}