feat(sdkserver): support catalog proxying in apiGachabaseFetch

internal/sdkserver/api.go

@@ -523,7 +523,8 @@ func apiGachabaseFetch(w http.ResponseWriter, r *http.Request) {
 		lang = "en"
 	}
 
-	if targetURL == "" && targetID != "" && targetType != "" {
+	if targetURL == "" && targetType != "" {
+		if targetID != "" {
 			switch targetType {
 			case "character", "avatar":
 				targetURL = fmt.Sprintf("https://hsr.gachabase.net/characters/%s/slug/%s?lang=%s", targetID, branch, lang)
@@ -532,7 +533,16 @@ func apiGachabaseFetch(w http.ResponseWriter, r *http.Request) {
 			case "relic":
 				targetURL = fmt.Sprintf("https://hsr.gachabase.net/relics/%s/slug/%s?lang=%s", targetID, branch, lang)
 			}
+		} else {
+			switch targetType {
+			case "characters", "avatars":
+				targetURL = fmt.Sprintf("https://hsr.gachabase.net/characters?branch=%s&lang=%s", branch, lang)
+			case "lightcones", "lcs":
+				targetURL = fmt.Sprintf("https://hsr.gachabase.net/lightcones?branch=%s&lang=%s", branch, lang)
 			}
+		}
+	}
+
 
 	if targetURL == "" {
 		writeJSON(w, map[string]any{"error": "missing url or id/type parameters", "status": 400})