mtmd, llama : Update HunyuanVL vision-language model support (#22037)

* mtmd, llama : add HunyuanVL vision-language model support

- add LLM_ARCH_HUNYUAN_VL with M-RoPE (XD-RoPE) support
- add PROJECTOR_TYPE_HUNYUANVL with PatchMerger vision encoder
- add HunyuanVL-specific M-RoPE position encoding for image tokens
- add GGUF conversion for HunyuanVL vision and text models
- add smoke test in tools/mtmd/tests.sh

* fix: fix HunyuanVL XD-RoPE h/w section order

* fix: Remove redundant code

* convert : fix HunyuanOCR / HunyuanVL conversion
 - Tested locally: both HunyuanOCR and HunyuanVL-4B convert to GGUF
 - successfully and produce correct inference output on Metal (F16 / Q8_0).

* clip : fix -Werror=misleading-indentation in bilinear resize

* fix CI: convert_hf_to_gguf type check error
 - convert_hf_to_gguf.py: give HunyuanVLTextModel.__init__ an explicit `dir_model: Path` parameter so ty can infer the type for load_hparams instead of reporting `Unknown | None`.

---------

Co-authored-by: wendadawen <wendadawen@tencent.com>

tools/mtmd/clip-impl.h

@@ -150,7 +150,7 @@
 #define TN_TOK_BOI         "v.boi"
 #define TN_TOK_EOI         "v.eoi"
 
-// hunyuanocr
+// hunyuanocr / hunyuanvl (shared GGUF tensor names)
 #define TN_MM_PRE_NORM     "mm.pre_norm.%s"
 #define TN_TOK_IMG_BEGIN   "mm.image_begin"
 #define TN_TOK_IMG_END     "mm.image_end"
@@ -303,6 +303,7 @@ enum projector_type {
     PROJECTOR_TYPE_KIMIK25,
     PROJECTOR_TYPE_NEMOTRON_V2_VL,
     PROJECTOR_TYPE_HUNYUANOCR,
+    PROJECTOR_TYPE_HUNYUANVL,
     PROJECTOR_TYPE_UNKNOWN,
 };
 
@@ -349,6 +350,7 @@ static std::map<projector_type, std::string> PROJECTOR_TYPE_NAMES = {
     { PROJECTOR_TYPE_KIMIK25,   "kimik25"},
     { PROJECTOR_TYPE_NEMOTRON_V2_VL, "nemotron_v2_vl"},
     { PROJECTOR_TYPE_HUNYUANOCR, "hunyuanocr"},
+    { PROJECTOR_TYPE_HUNYUANVL,  "hunyuanvl"},
 };
 
 static projector_type clip_projector_type_from_string(const std::string & str) {