feat: 订阅流量信息中的 expire <=0 时, 视为空

backend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "sub-store",
-  "version": "2.19.98",
+  "version": "2.19.99",
   "description": "Advanced Subscription Manager for QX, Loon, Surge, Stash and Shadowrocket.",
   "main": "src/main.js",
   "scripts": {

backend/src/utils/flow.js

@@ -342,6 +342,12 @@ export function normalizeFlowHeader(flowHeaders) {
                         ) {
                             try {
                                 decodedValue = Number(decodedValue).toFixed(0);
+                                if (
+                                    ['expire'].includes(key) &&
+                                    decodedValue <= 0
+                                ) {
+                                    decodedValue = '';
+                                }
                             } catch (e) {
                                 $.error(
                                     `Failed to convert value for key "${key}=${encodedValue}": ${