feat: add Query method to ILLMService interface

- Add Query method to ILLMService interface for unified AI service access
- Update combinedLLMService to include querier functionality
- Add comprehensive tests for ILLMService Query method
- Support both basic query and custom schema query through unified interface
- Add environment variable checks for test reliability

This allows users to access all AI capabilities (planning, assertion, and query) 
through a single ILLMService interface, providing better API consistency and ease of use.

uixt/ai/ai.go

@@ -7,10 +7,11 @@ import (
 	"github.com/httprunner/httprunner/v5/uixt/option"
 )
 
-// ILLMService 定义了 LLM 服务接口，包括规划和断言功能
+// ILLMService 定义了 LLM 服务接口，包括规划、断言和查询功能
 type ILLMService interface {
 	Call(ctx context.Context, opts *PlanningOptions) (*PlanningResult, error)
 	Assert(ctx context.Context, opts *AssertOptions) (*AssertionResult, error)
+	Query(ctx context.Context, opts *QueryOptions) (*QueryResult, error)
 	// RegisterTools registers tools for function calling
 	RegisterTools(tools []*schema.ToolInfo) error
 }
@@ -29,18 +30,24 @@ func NewLLMService(modelType option.LLMServiceType) (ILLMService, error) {
 	if err != nil {
 		return nil, err
 	}
+	querier, err := NewQuerier(context.Background(), modelConfig)
+	if err != nil {
+		return nil, err
+	}
 
 	return &combinedLLMService{
 		planner:  planner,
 		asserter: asserter,
+		querier:  querier,
 	}, nil
 }
 
-// combinedLLMService 实现了 ILLMService 接口，组合了规划和断言功能
-// ⭐️支持采用不同的模型服务进行规划和断言
+// combinedLLMService 实现了 ILLMService 接口，组合了规划、断言和查询功能
+// ⭐️支持采用不同的模型服务进行规划、断言和查询
 type combinedLLMService struct {
 	planner  IPlanner  // 提供规划功能
 	asserter IAsserter // 提供断言功能
+	querier  IQuerier  // 提供查询功能
 }
 
 // Call 执行规划功能
@@ -53,9 +60,14 @@ func (c *combinedLLMService) Assert(ctx context.Context, opts *AssertOptions) (*
 	return c.asserter.Assert(ctx, opts)
 }
 
+// Query 执行查询功能
+func (c *combinedLLMService) Query(ctx context.Context, opts *QueryOptions) (*QueryResult, error) {
+	return c.querier.Query(ctx, opts)
+}
+
 // RegisterTools registers tools for function calling
 func (c *combinedLLMService) RegisterTools(tools []*schema.ToolInfo) error {
-	// Only register tools to planner since asserter doesn't need tools
+	// Only register tools to planner since asserter and querier don't need tools
 	if planner, ok := c.planner.(*Planner); ok {
 		return planner.RegisterTools(tools)
 	}