feat: 优化 Model 连接测试，支持阿里云 DashScope

- 添加阿里云 provider 支持
- 添加连接超时 (10s)
- 优化 URL 构建逻辑
- 默认状态改为 inactive
- 添加详细日志

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

server/cmd/api/main.go

@@ -170,11 +170,11 @@ func main() {
 	modelGroup := r.Group("/model")
 	{
 		modelGroup.GET("/list", modelHandler.List)
-		modelGroup.GET("/:id", modelHandler.GetByID)
+		modelGroup.POST("/test", modelHandler.Test)
 		modelGroup.POST("/add", modelHandler.Create)
+		modelGroup.GET("/:id", modelHandler.GetByID)
 		modelGroup.PUT("/:id", modelHandler.Update)
 		modelGroup.DELETE("/:id", modelHandler.Delete)
-		modelGroup.POST("/test", modelHandler.Test)
 	}
 
 	// 系统信息模块