Fix audit timeline app names and stabilize backend tests

backend/internal/middleware/audit_middleware.go

@@ -144,6 +144,19 @@ func AuditMiddleware(config AuditConfig) fiber.Handler {
 			"tenant_id":    tenantID,
 			"request_body": maskedBody,
 		}
+		// 핸들러에서 추가한 상세 정보를 병합합니다.
+		if extra := c.Locals("audit_details_extra"); extra != nil {
+			switch v := extra.(type) {
+			case map[string]string:
+				for key, value := range v {
+					details[key] = value
+				}
+			case map[string]interface{}:
+				for key, value := range v {
+					details[key] = value
+				}
+			}
+		}
 		if skipTimeline, ok := c.Locals("auth_timeline_skip").(bool); ok && skipTimeline {
 			details["auth_timeline_skip"] = true
 		}