mtmd: Add DeepSeekOCR 2 Support (#20975)

* mtmd: DeepSeek-OCR 2 support, with multi-tile dynamic resolution

* introduced clip_image_f32::add_viewsep

* address PR review

- drop redundant ggml_cpy ops in both deepseekocr versions build
- drop no-op ggml_cont in build_sam
- assert num_image_tokens deepseekocr2
- view_seperator as (1, n_embd) at conversion (for both versions)
- drop redundant ggml_reshape_2d

* Update tools/mtmd/models/deepseekocr2.cpp

Co-authored-by: Xuan-Son Nguyen <thichthat@gmail.com>

---------

Co-authored-by: Xuan-Son Nguyen <thichthat@gmail.com>

tools/mtmd/clip-impl.h

@@ -188,6 +188,8 @@
 #define TN_SAM_FFN_DOWN   "v.sam.blk.%d.mlp.lin2.%s"
 #define TN_SAM_NECK       "v.sam.neck.%d.%s"
 #define TN_SAM_NET        "v.sam.net_%d.%s"
+// deepseek-ocr-2
+#define TN_RESMPL_QUERY  "v.resample_query_%d.%s"
 // (conformer) lfm2
 #define TN_PRE_ENCODE_OUT  "a.pre_encode.out.%s"
 #define TN_FFN_NORM        "%s.blk.%d.ffn_norm.%s"
@@ -337,6 +339,7 @@ enum projector_type {
     PROJECTOR_TYPE_JANUS_PRO,
     PROJECTOR_TYPE_DOTS_OCR,
     PROJECTOR_TYPE_DEEPSEEKOCR,
+    PROJECTOR_TYPE_DEEPSEEKOCR2,
     PROJECTOR_TYPE_LFM2A,
     PROJECTOR_TYPE_GLM4V,
     PROJECTOR_TYPE_YOUTUVL,
@@ -386,6 +389,7 @@ static std::map<projector_type, std::string> PROJECTOR_TYPE_NAMES = {
     { PROJECTOR_TYPE_JANUS_PRO, "janus_pro"},
     { PROJECTOR_TYPE_DOTS_OCR,  "dots_ocr"},
     { PROJECTOR_TYPE_DEEPSEEKOCR,"deepseekocr"},
+    { PROJECTOR_TYPE_DEEPSEEKOCR2,"deepseekocr2"},
     { PROJECTOR_TYPE_LFM2A,     "lfm2a"},
     { PROJECTOR_TYPE_GLM4V,     "glm4v"},
     { PROJECTOR_TYPE_YOUTUVL,   "youtuvl"},
@@ -424,6 +428,9 @@ struct clip_image_f32 {
     int ny;
 
     std::vector<float> buf;
+
+    // marks the global view in e.g., DeepSeek-OCR Models
+    bool add_viewsep = false;
 };
 
 //