Filter non-English expansions and prefer stock sources

backend/services/cse.go

@@ -307,11 +307,11 @@ func extractYouTubeID(link string) string {
 
 func sourceWeight(source string) int {
 	switch source {
-	case "Google Video":
-		return 3
 	case "Envato":
-		return 2
+		return 3
 	case "Artgrid":
+		return 2
+	case "Google Video":
 		return 1
 	default:
 		return 0

backend/services/gemini.go

@@ -154,6 +154,7 @@ English base translation: ` + englishBase,
 
 	queries := fallbackQueryExpansion(query, englishBase)
 	seen := map[string]bool{}
+	englishOnly := !strings.EqualFold(strings.TrimSpace(englishBase), strings.TrimSpace(query))
 	for _, existing := range queries {
 		seen[strings.ToLower(strings.TrimSpace(existing))] = true
 	}
@@ -162,6 +163,9 @@ English base translation: ` + englishBase,
 		if trimmed == "" {
 			continue
 		}
+		if englishOnly && !isLikelyEnglishQuery(trimmed) {
+			continue
+		}
 		key := strings.ToLower(trimmed)
 		if seen[key] {
 			continue
@@ -522,6 +526,20 @@ func looksMostlyASCII(text string) bool {
 	return ascii >= len(runes)*8/10
 }
 
+func isLikelyEnglishQuery(text string) bool {
+	alpha := 0
+	nonASCII := 0
+	for _, r := range text {
+		switch {
+		case r >= 'A' && r <= 'Z', r >= 'a' && r <= 'z':
+			alpha++
+		case r > 127:
+			nonASCII++
+		}
+	}
+	return alpha > 0 && nonASCII == 0
+}
+
 func translateKoreanMediaTerms(query string) string {
 	replacements := map[string]string{
 		"숲속":  "forest",