feat: implement core architecture (v0.0.2)

- Implement Config class with YAML loading and environment variable support
- Implement Provider interface and factory pattern
- Implement SiliconFlow provider as example
- Implement Translator core class with prompt management
- Create CLI entry point
- Add configuration template and unit tests
- Update changelog and discussion records

Version: 0.0.2

internal/translator/translator.go

@@ -0,0 +1,177 @@
+package translator
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/titor/fanyi/internal/config"
+	"github.com/titor/fanyi/internal/provider"
+)
+
+// Translator 核心翻译类
+type Translator struct {
+	config   *config.Config
+	provider provider.Provider
+	prompt   *PromptManager
+}
+
+// NewTranslator 创建翻译器实例
+func NewTranslator(config *config.Config, provider provider.Provider) *Translator {
+	return &Translator{
+		config:   config,
+		provider: provider,
+		prompt:   NewPromptManager(config.Prompts),
+	}
+}
+
+// Translate 执行翻译
+func (t *Translator) Translate(ctx context.Context, text string, options *TranslateOptions) (*TranslateResult, error) {
+	// 设置超时
+	timeoutCtx, cancel := context.WithTimeout(ctx, time.Duration(t.config.Timeout)*time.Second)
+	defer cancel()
+
+	// 选择Prompt
+	prompt := ""
+	if options.PromptName != "" {
+		prompt = t.prompt.GetPrompt(options.PromptName)
+	}
+
+	// 构建请求
+	req := &provider.TranslateRequest{
+		Text:     text,
+		FromLang: options.FromLang,
+		ToLang:   options.ToLang,
+		Prompt:   prompt,
+		Model:    t.selectModel(options.Model),
+		Options:  options.ExtraOptions,
+	}
+
+	// 调用厂商API
+	resp, err := t.provider.Translate(timeoutCtx, req)
+	if err != nil {
+		return nil, fmt.Errorf("翻译失败: %w", err)
+	}
+
+	// 构建结果
+	return &TranslateResult{
+		Original:   text,
+		Translated: resp.Text,
+		FromLang:   resp.FromLang,
+		ToLang:     resp.ToLang,
+		Model:      resp.Model,
+		Usage:      resp.Usage,
+	}, nil
+}
+
+// TranslateWithProvider 使用指定厂商执行翻译
+func (t *Translator) TranslateWithProvider(ctx context.Context, text string, providerName string, options *TranslateOptions) (*TranslateResult, error) {
+	// 创建指定厂商实例
+	providerConfig, err := t.config.GetProviderConfig(providerName)
+	if err != nil {
+		return nil, fmt.Errorf("获取厂商配置失败: %w", err)
+	}
+
+	// 创建厂商实例
+	providerInstance, err := provider.CreateProvider(providerName, provider.ProviderConfig{
+		APIHost: providerConfig.APIHost,
+		APIKey:  providerConfig.APIKey,
+		Model:   providerConfig.Model,
+	})
+	if err != nil {
+		return nil, fmt.Errorf("创建厂商实例失败: %w", err)
+	}
+
+	// 临时切换厂商
+	originalProvider := t.provider
+	t.provider = providerInstance
+	defer func() {
+		t.provider = originalProvider
+	}()
+
+	// 执行翻译
+	return t.Translate(ctx, text, options)
+}
+
+// selectModel 选择模型
+func (t *Translator) selectModel(model string) string {
+	if model != "" {
+		return model
+	}
+	return t.config.DefaultModel
+}
+
+// GetProvider 获取当前厂商
+func (t *Translator) GetProvider() provider.Provider {
+	return t.provider
+}
+
+// GetConfig 获取配置
+func (t *Translator) GetConfig() *config.Config {
+	return t.config
+}
+
+// GetPromptManager 获取Prompt管理器
+func (t *Translator) GetPromptManager() *PromptManager {
+	return t.prompt
+}
+
+// SetTimeout 设置超时时间
+func (t *Translator) SetTimeout(seconds int) {
+	t.config.Timeout = seconds
+}
+
+// TranslateOptions 翻译选项
+type TranslateOptions struct {
+	FromLang     string
+	ToLang       string
+	PromptName   string
+	Model        string
+	Temperature  float64
+	ExtraOptions map[string]interface{}
+}
+
+// TranslateResult 翻译结果
+type TranslateResult struct {
+	Original   string
+	Translated string
+	FromLang   string
+	ToLang     string
+	Model      string
+	Usage      *provider.Usage
+}
+
+// String 返回翻译结果的字符串表示
+func (r *TranslateResult) String() string {
+	return r.Translated
+}
+
+// TranslateResultWithInfo 带详细信息的翻译结果
+type TranslateResultWithInfo struct {
+	Result    *TranslateResult
+	Duration  time.Duration
+	Provider  string
+	Timestamp time.Time
+}
+
+// BatchTranslate 批量翻译结果
+type BatchTranslateRequest struct {
+	Texts   []string
+	Options *TranslateOptions
+}
+
+// BatchTranslateResult 批量翻译结果
+type BatchTranslateResult struct {
+	Results []*TranslateResult
+	Errors  []error
+	Summary BatchTranslateSummary
+}
+
+// BatchTranslateSummary 批量翻译摘要
+type BatchTranslateSummary struct {
+	Total     int
+	Success   int
+	Failed    int
+	Duration  time.Duration
+	AvgTokens int
+}