feat: optimize UI-TARS parser with coordinate conversion and action mapping

- Add action mapping for UI-TARS parser to convert action names to option.ActionName
- Implement bounding box to center point coordinate conversion for better accuracy
- Update coordinate normalization to handle coordinates > 1000 properly
- Enhance test cases to verify coordinate scaling and center point conversion
- Improve action argument processing with proper coordinate transformation
- Add comprehensive test coverage for coordinate conversion edge cases

Key improvements:
- Bounding box [x1,y1,x2,y2] now converts to center point [cx,cy] for actions
- Coordinate scaling properly handles different screen resolutions
- Action names are mapped through doubao_1_5_ui_tars_action_mapping
- Enhanced error handling for invalid coordinate formats

uixt/option/action.go

@@ -2,6 +2,7 @@ package option
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
 	"math/rand/v2"
 	"reflect"
@@ -330,6 +331,18 @@ func (o *ActionOptions) Options() []ActionOption {
 	return options
 }
 
+func (o *ActionOptions) ToMap() map[string]interface{} {
+	result := make(map[string]interface{})
+	b, err := json.Marshal(o)
+	if err != nil {
+		return nil
+	}
+	if err := json.Unmarshal(b, &result); err != nil {
+		return nil
+	}
+	return result
+}
+
 func (o *ActionOptions) ApplyTapOffset(absX, absY float64) (float64, float64) {
 	if len(o.TapOffset) == 2 {
 		absX += float64(o.TapOffset[0])