refactor: merge ActionSummary and Thought fields to eliminate duplication

- Remove redundant ActionSummary field from PlanningResult struct
- Update parsers to use unified Thought field instead of duplicate fields
- Modify chat interface to display Thought instead of ActionSummary
- Update planner logging to use thought instead of summary
- Adjust prompt templates to use thought field consistently
- Switch test LLM service from UI-TARS to DoubaoVL
- Add default parameter handling for sleep tool

uixt/ai/parser_ui_tars.go

@@ -52,10 +52,9 @@ func (p *UITARSContentParser) Parse(content string, size types.Size) (*PlanningR
 	toolCalls := convertActionsToToolCalls(actions, p.actionMapping)
 
 	return &PlanningResult{
-		ToolCalls:     toolCalls,
-		ActionSummary: thought,
-		Thought:       thought,
-		Content:       content,
+		ToolCalls: toolCalls,
+		Thought:   thought,
+		Content:   content,
 	}, nil
 }