mtmd, model : merge HunyuanOCR into HunyuanVL and fix OCR vision precision (#23329)

- HunyuanOCR shares the same HF arch and vision layout as HunyuanVL butwas split into a separate path that skipped the +0.1 bilinear sampler used by the HF reference.
- Collapse OCR into the HUNYUANVL projector + HUNYUAN_VL text arch

tools/mtmd/clip-model.h

@@ -520,7 +520,7 @@ struct clip_model {
     ggml_tensor * mm_boi = nullptr;
     ggml_tensor * mm_eoi = nullptr;
 
-    // hunyuanocr perceiver
+    // hunyuanvl perceiver
     ggml_tensor * mm_pre_norm_w  = nullptr;
     ggml_tensor * mm_img_begin   = nullptr;
     ggml_tensor * mm_img_end     = nullptr;