Add streaming support and refactor Chat UI

- Add run_stream method to AgentCore for streaming output
- Add base_url parameter to LLM clients for OpenRouter support
- Add xbot module for new agent implementation
- Refactor Chat.vue into composable + components (ChatHeader, ChatMessage, ChatInput, ChatSidebar, ChatAgentSelector)
- Add ChatStream handler for SSE streaming in Go server
- Add UseXBot field to chat request

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/internal/service/tool_service.go

@@ -56,23 +56,18 @@ func (s *ToolService) DeleteTool(id string) error {
 
 // InitDefaultTools 初始化默认工具到数据库
 func (s *ToolService) InitDefaultTools() error {
-	log.Println("[ToolService] Starting init default tools...")
-
 	// 删除现有的系统工具，重新插入
 	s.toolRepo.DB().Where("provider = ?", "system").Delete(&model.Tool{})
 
 	// 插入默认工具
 	tools := s.getDefaultTools()
-	log.Printf("[ToolService] Inserting %d default tools...", len(tools))
-
 	for _, tool := range tools {
 		if err := s.toolRepo.Create(&tool); err != nil {
-			log.Printf("[ToolService] Create tool error: %v", err)
 			return err
 		}
 	}
 
-	log.Printf("[ToolService] Default tools initialized successfully")
+	log.Printf("[ToolService] Loaded %d default tools", len(tools))
 	return nil
 }