docs: add sakana/sakana-namazu (#487)

Author: Lookoff-AIMLAPI

docs/SUMMARY.md

@@ -307,6 +307,7 @@
     * [Laguna S 2.1](api-references/text-models-llm/Poolside/laguna-s-2.1.md)
   * [Sakana AI](api-references/text-models-llm/Sakana-AI/README.md)
     * [Fugu Ultra](api-references/text-models-llm/Sakana-AI/fugu-ultra.md)
+    * [Sakana Namazu](api-references/text-models-llm/Sakana-AI/sakana-namazu.md)
   * [StepFun](api-references/text-models-llm/stepfun/README.md)
     * [Step3.7 Flash](api-references/text-models-llm/stepfun/step3.7-flash.md)
   * [switchpoint](api-references/text-models-llm/switchpoint/README.md)