feat: add SEARCH_ALIASES for model and misc nodes

Add search aliases to model-related and miscellaneous nodes:
- Model nodes: nodes_model_merging.py, nodes_model_advanced.py, nodes_lora_extract.py
- Sampler nodes: nodes_custom_sampler.py, nodes_align_your_steps.py
- Control nodes: nodes_controlnet.py, nodes_attention_multiply.py, nodes_hooks.py
- Training nodes: nodes_train.py, nodes_dataset.py
- Utility nodes: nodes_logic.py, nodes_canny.py, nodes_differential_diffusion.py
- Architecture-specific: nodes_sd3.py, nodes_pixart.py, nodes_lumina2.py, nodes_kandinsky5.py, nodes_hidream.py, nodes_fresca.py, nodes_hunyuan3d.py
- Media nodes: nodes_load_3d.py, nodes_webcam.py, nodes_preview_any.py, nodes_wanmove.py

Uses search_aliases parameter in io.Schema() for v3 nodes, SEARCH_ALIASES class attribute for legacy nodes.

comfy_extras/nodes_model_merging.py

@@ -91,6 +91,7 @@ class CLIPMergeSimple:
 
 
 class CLIPSubtract:
+    SEARCH_ALIASES = ["clip difference", "text encoder subtract"]
     @classmethod
     def INPUT_TYPES(s):
         return {"required": { "clip1": ("CLIP",),
@@ -113,6 +114,7 @@ class CLIPSubtract:
 
 
 class CLIPAdd:
+    SEARCH_ALIASES = ["combine clip"]
     @classmethod
     def INPUT_TYPES(s):
         return {"required": { "clip1": ("CLIP",),
@@ -225,6 +227,7 @@ def save_checkpoint(model, clip=None, vae=None, clip_vision=None, filename_prefi
     comfy.sd.save_checkpoint(output_checkpoint, model, clip, vae, clip_vision, metadata=metadata, extra_keys=extra_keys)
 
 class CheckpointSave:
+    SEARCH_ALIASES = ["save model", "export checkpoint", "merge save"]
     def __init__(self):
         self.output_dir = folder_paths.get_output_directory()
 
@@ -337,6 +340,7 @@ class VAESave:
         return {}
 
 class ModelSave:
+    SEARCH_ALIASES = ["export model", "checkpoint save"]
     def __init__(self):
         self.output_dir = folder_paths.get_output_directory()