fix(urlvalidator): 移除 ValidateURLFormat 返回值的末尾斜杠

修复 API Key 账号 base_url 末尾带斜杠时导致的双斜杠问题

backend/internal/util/urlvalidator/validator.go

@@ -46,7 +46,7 @@ func ValidateURLFormat(raw string, allowInsecureHTTP bool) (string, error) {
 		}
 	}
 
-	return trimmed, nil
+	return strings.TrimRight(trimmed, "/"), nil
 }
 
 func ValidateHTTPSURL(raw string, opts ValidationOptions) (string, error) {

backend/internal/util/urlvalidator/validator_test.go

@@ -21,4 +21,31 @@ func TestValidateURLFormat(t *testing.T) {
 	if _, err := ValidateURLFormat("https://example.com:bad", true); err == nil {
 		t.Fatalf("expected invalid port to fail")
 	}
+
+	// 验证末尾斜杠被移除
+	normalized, err := ValidateURLFormat("https://example.com/", false)
+	if err != nil {
+		t.Fatalf("expected trailing slash url to pass, got %v", err)
+	}
+	if normalized != "https://example.com" {
+		t.Fatalf("expected trailing slash to be removed, got %s", normalized)
+	}
+
+	// 验证多个末尾斜杠被移除
+	normalized, err = ValidateURLFormat("https://example.com///", false)
+	if err != nil {
+		t.Fatalf("expected multiple trailing slashes to pass, got %v", err)
+	}
+	if normalized != "https://example.com" {
+		t.Fatalf("expected all trailing slashes to be removed, got %s", normalized)
+	}
+
+	// 验证带路径的 URL 末尾斜杠被移除
+	normalized, err = ValidateURLFormat("https://example.com/api/v1/", false)
+	if err != nil {
+		t.Fatalf("expected trailing slash url with path to pass, got %v", err)
+	}
+	if normalized != "https://example.com/api/v1" {
+		t.Fatalf("expected trailing slash to be removed from path, got %s", normalized)
+	}
 }