feat: implement multi-model service configuration support

- Support configuring multiple LLM services simultaneously
- Auto-derive model names from service types to simplify configuration
- Maintain backward compatibility with existing configurations
- Refactor configuration logic into dedicated env module
- Add comprehensive unit test coverage
- Update documentation with new configuration approach

uixt/ai/ai.go

@@ -2,17 +2,8 @@ package ai
 
 import (
 	"context"
-	"fmt"
-	"os"
-	"strings"
-	"time"
 
-	"github.com/cloudwego/eino-ext/components/model/openai"
-	"github.com/httprunner/httprunner/v5/code"
-	"github.com/httprunner/httprunner/v5/internal/config"
 	"github.com/httprunner/httprunner/v5/uixt/option"
-	"github.com/pkg/errors"
-	"github.com/rs/zerolog/log"
 )
 
 // ILLMService 定义了 LLM 服务接口，包括规划和断言功能
@@ -58,100 +49,3 @@ func (c *combinedLLMService) Call(ctx context.Context, opts *PlanningOptions) (*
 func (c *combinedLLMService) Assert(ctx context.Context, opts *AssertOptions) (*AssertionResult, error) {
 	return c.asserter.Assert(ctx, opts)
 }
-
-// LLM model config env variables
-const (
-	EnvOpenAIBaseURL = "OPENAI_BASE_URL"
-	EnvOpenAIAPIKey  = "OPENAI_API_KEY"
-	EnvModelName     = "LLM_MODEL_NAME"
-)
-
-const (
-	defaultTimeout = 30 * time.Second
-)
-
-type ModelConfig struct {
-	*openai.ChatModelConfig
-	ModelType option.LLMServiceType
-}
-
-// GetModelConfig get OpenAI config
-func GetModelConfig(modelType option.LLMServiceType) (*ModelConfig, error) {
-	if err := config.LoadEnv(); err != nil {
-		return nil, errors.Wrap(code.LoadEnvError, err.Error())
-	}
-
-	openaiBaseURL := os.Getenv(EnvOpenAIBaseURL)
-	if openaiBaseURL == "" {
-		return nil, errors.Wrapf(code.LLMEnvMissedError,
-			"env %s missed", EnvOpenAIBaseURL)
-	}
-	openaiAPIKey := os.Getenv(EnvOpenAIAPIKey)
-	if openaiAPIKey == "" {
-		return nil, errors.Wrapf(code.LLMEnvMissedError,
-			"env %s missed", EnvOpenAIAPIKey)
-	}
-	modelName := os.Getenv(EnvModelName)
-	if modelName == "" {
-		return nil, errors.Wrapf(code.LLMEnvMissedError,
-			"env %s missed", EnvModelName)
-	}
-
-	// Validate model type and model name compatibility
-	if err := validateModelType(modelType, modelName); err != nil {
-		return nil, err
-	}
-
-	// https://www.volcengine.com/docs/82379/1536429
-	temperature := float32(0)
-	topP := float32(0.7)
-	modelConfig := &openai.ChatModelConfig{
-		BaseURL:     openaiBaseURL,
-		APIKey:      openaiAPIKey,
-		Model:       modelName,
-		Timeout:     defaultTimeout,
-		Temperature: &temperature,
-		TopP:        &topP,
-	}
-
-	// log config info
-	log.Info().Str("model", modelConfig.Model).
-		Str("baseURL", modelConfig.BaseURL).
-		Str("apiKey", maskAPIKey(modelConfig.APIKey)).
-		Str("timeout", defaultTimeout.String()).
-		Msg("get model config")
-
-	return &ModelConfig{
-		ChatModelConfig: modelConfig,
-		ModelType:       modelType,
-	}, nil
-}
-
-func validateModelType(modelType option.LLMServiceType, modelName string) error {
-	switch modelType {
-	case option.DOUBAO_1_5_UI_TARS_250428:
-		if !strings.Contains(modelName, string(modelType)) {
-			return fmt.Errorf("model name %s is not supported for %s", modelName, modelType)
-		}
-		return nil
-	case option.DOUBAO_1_5_THINKING_VISION_PRO_250428:
-		if !strings.Contains(modelName, string(modelType)) {
-			return fmt.Errorf("model name %s is not supported", modelName)
-		}
-		return nil
-	}
-
-	return fmt.Errorf("model type %s is not supported, supported types: %s, %s",
-		modelType,
-		option.DOUBAO_1_5_UI_TARS_250428,
-		option.DOUBAO_1_5_THINKING_VISION_PRO_250428)
-}
-
-// maskAPIKey masks the API key
-func maskAPIKey(key string) string {
-	if len(key) <= 8 {
-		return "******"
-	}
-
-	return key[:4] + "******" + key[len(key)-4:]
-}