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/provider/provider.go

@@ -0,0 +1,108 @@
+package provider
+
+import (
+	"context"
+	"fmt"
+)
+
+// Provider 厂商接口
+type Provider interface {
+	// Translate 调用厂商API进行翻译
+	Translate(ctx context.Context, req *TranslateRequest) (*TranslateResponse, error)
+
+	// Name 返回厂商名称
+	Name() string
+
+	// Validate 验证配置是否有效
+	Validate() error
+}
+
+// TranslateRequest 翻译请求
+type TranslateRequest struct {
+	Text     string                 `json:"text"`
+	FromLang string                 `json:"from_lang"`
+	ToLang   string                 `json:"to_lang"`
+	Prompt   string                 `json:"prompt"`
+	Model    string                 `json:"model"`
+	Options  map[string]interface{} `json:"options"`
+}
+
+// TranslateResponse 翻译响应
+type TranslateResponse struct {
+	Text        string `json:"text"`
+	FromLang    string `json:"from_lang"`
+	ToLang      string `json:"to_lang"`
+	Model       string `json:"model"`
+	Usage       *Usage `json:"usage"`
+	RawResponse []byte `json:"raw_response,omitempty"`
+}
+
+// Usage 用量统计
+type Usage struct {
+	PromptTokens     int `json:"prompt_tokens"`
+	CompletionTokens int `json:"completion_tokens"`
+	TotalTokens      int `json:"total_tokens"`
+}
+
+// ProviderConfig 厂商配置
+type ProviderConfig struct {
+	APIHost string `json:"api_host"`
+	APIKey  string `json:"api_key"`
+	Model   string `json:"model"`
+}
+
+// TranslateError 翻译错误
+type TranslateError struct {
+	Code    string `json:"code"`
+	Message string `json:"message"`
+	Details string `json:"details,omitempty"`
+}
+
+// Error 实现error接口
+func (e *TranslateError) Error() string {
+	if e.Details != "" {
+		return fmt.Sprintf("%s: %s (%s)", e.Code, e.Message, e.Details)
+	}
+	return fmt.Sprintf("%s: %s", e.Code, e.Message)
+}
+
+// NewTranslateError 创建翻译错误
+func NewTranslateError(code, message string) *TranslateError {
+	return &TranslateError{
+		Code:    code,
+		Message: message,
+	}
+}
+
+// NewTranslateErrorWithDetails 创建带详情的翻译错误
+func NewTranslateErrorWithDetails(code, message, details string) *TranslateError {
+	return &TranslateError{
+		Code:    code,
+		Message: message,
+		Details: details,
+	}
+}
+
+// IsNetworkError 检查是否为网络错误
+func IsNetworkError(err error) bool {
+	if translateErr, ok := err.(*TranslateError); ok {
+		return translateErr.Code == "NETWORK_ERROR"
+	}
+	return false
+}
+
+// IsRateLimitError 检查是否为限流错误
+func IsRateLimitError(err error) bool {
+	if translateErr, ok := err.(*TranslateError); ok {
+		return translateErr.Code == "RATE_LIMIT"
+	}
+	return false
+}
+
+// IsAuthError 检查是否为认证错误
+func IsAuthError(err error) bool {
+	if translateErr, ok := err.(*TranslateError); ok {
+		return translateErr.Code == "AUTH_ERROR" || translateErr.Code == "INVALID_API_KEY"
+	}
+	return false
+}