feat(equalize): Enhance EqualizeConfig to support external API URL

- Added ExternalAPIURL to EqualizeConfig for public EQ interface usage.
- Updated loadEqualize function to initialize ExternalAPIURL from environment variable or default value.
- Refactored reqEqualize method to accept apiURL as a parameter for improved flexibility.
- Introduced eqAPIURL method to determine the appropriate API URL based on the source.

internal/config/equalize.go

@@ -2,19 +2,32 @@ package config
 
 import "os"
 
+const defaultExternalEQAPIURL = "https://autoeq.app/equalize"
+
 type EqualizeConfig struct {
-	APIURL string
+	APIURL         string // 内网 EQ 接口（正式环境 Eafonyoung 源使用）
+	ExternalAPIURL string // 公网 EQ 接口（正式环境非 Eafonyoung 源使用）
 }
 
 func loadEqualize(env string) EqualizeConfig {
+	external := getEnv("EQ_EXTERNAL_API_URL", defaultExternalEQAPIURL)
 	if os.Getenv("EQ_API_URL") != "" {
-		return EqualizeConfig{APIURL: os.Getenv("EQ_API_URL")}
+		return EqualizeConfig{
+			APIURL:         os.Getenv("EQ_API_URL"),
+			ExternalAPIURL: external,
+		}
 	}
 
 	switch env {
 	case "production":
-		return EqualizeConfig{APIURL: "http://172.31.18.70:8000/equalize"}
+		return EqualizeConfig{
+			APIURL:         "http://172.31.18.70:8000/equalize",
+			ExternalAPIURL: external,
+		}
 	default:
-		return EqualizeConfig{APIURL: "https://autoeq.app/equalize"}
+		return EqualizeConfig{
+			APIURL:         defaultExternalEQAPIURL,
+			ExternalAPIURL: external,
+		}
 	}
 }

internal/handler/curve.go

@@ -254,7 +254,8 @@ func (h *CurveHandler) getCurvePointFromPEQ(ctx context.Context, brand, name, ta
 		bassBoost = map[string]any{"gain": 0, "fc": 100, "q": 0.7}
 	}
 
-	resp, err := h.reqEqualize(headPhone, measurement, targetParam, bassBoost, deref(m.Source), deref(m.Rig))
+	apiURL := h.eqAPIURL(deref(m.Source))
+	resp, err := h.reqEqualize(apiURL, headPhone, measurement, targetParam, bassBoost, deref(m.Source), deref(m.Rig))
 	if err != nil {
 		return "", err
 	}
@@ -262,8 +263,16 @@ func (h *CurveHandler) getCurvePointFromPEQ(ctx context.Context, brand, name, ta
 	return resp, nil
 }
 
+// eqAPIURL 正式环境非 Eafonyoung 源走公网 EQ，其余走内网/默认地址
+func (h *CurveHandler) eqAPIURL(source string) string {
+	if source != "Eafonyoung" && h.cfg.ExternalAPIURL != "" && h.cfg.ExternalAPIURL != h.cfg.APIURL {
+		return h.cfg.ExternalAPIURL
+	}
+	return h.cfg.APIURL
+}
+
 // reqEqualize 调用 autoeq API
-func (h *CurveHandler) reqEqualize(headPhone string, measurement map[string]any, target any, bassBoost map[string]any, source, rig string) (string, error) {
+func (h *CurveHandler) reqEqualize(apiURL, headPhone string, measurement map[string]any, target any, bassBoost map[string]any, source, rig string) (string, error) {
 	gain := floatVal(bassBoost, "gain", 0)
 	fc := intVal(bassBoost, "fc", 100)
 	q := floatVal(bassBoost, "q", 0.7)
@@ -317,7 +326,7 @@ func (h *CurveHandler) reqEqualize(headPhone string, measurement map[string]any,
 		return "", fmt.Errorf("marshal eq request: %w", err)
 	}
 
-	httpReq, err := http.NewRequestWithContext(context.Background(), http.MethodPost, h.cfg.APIURL, bytes.NewReader(jsonData))
+	httpReq, err := http.NewRequestWithContext(context.Background(), http.MethodPost, apiURL, bytes.NewReader(jsonData))
 	if err != nil {
 		return "", fmt.Errorf("create eq request: %w", err)
 	}
@@ -330,7 +339,8 @@ func (h *CurveHandler) reqEqualize(headPhone string, measurement map[string]any,
 	h.log.Info("eq api response",
 		zap.String("headPhone", headPhone),
 		zap.Duration("latency", elapsed),
-		zap.String("url", h.cfg.APIURL),
+		zap.String("url", apiURL),
+		zap.String("source", source),
 	)
 	if err != nil {
 		h.log.Error("eq api request failed", zap.Duration("latency", elapsed), zap.Error(err))