spec: add eagle3-v3 support for gpt-oss model (#25794)

src/llama-hparams.h

@@ -47,6 +47,7 @@ struct llama_hparams {
     bool use_par_res;
     bool swin_norm;
     bool norm_before_residual = false;
+    bool norm_before_fc       = false;
 
     uint32_t n_ctx_train; // context size the model was trained on
     uint32_t n_embd;