api: remove unused create fields

These fields are deprecated, but specifying them will not do anything. Removing them as the other deprecated fields will still work, but these do not, so they dont match our existing pattern.

api/types.go

@@ -308,15 +308,8 @@ type CreateRequest struct {
 	Parameters map[string]any    `json:"parameters,omitempty"`
 	Messages   []Message         `json:"messages,omitempty"`
 
-	// Deprecated: set with the other request options
-	Modelfile string `json:"modelfile"`
-
 	// Deprecated: set the model name with Model instead
 	Name string `json:"name"`
-
-	// Deprecated: set the file content with Modelfile instead
-	Path string `json:"path"`
-
 	// Deprecated: use Quantize instead
 	Quantization string `json:"quantization,omitempty"`
 }