feat: 支持自定义订阅流量信息

backend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "sub-store",
-  "version": "2.14.248",
+  "version": "2.14.249",
   "description": "Advanced Subscription Manager for QX, Loon, Surge, Stash and ShadowRocket.",
   "main": "src/main.js",
   "scripts": {

backend/src/restful/download.js

@@ -124,6 +124,9 @@ async function downloadSubscription(req, res) {
                     );
                 }
             }
+            if (sub.subUserinfo) {
+                res.set('subscription-userinfo', sub.subUserinfo);
+            }
 
             if (platform === 'JSON') {
                 res.set('Content-Type', 'application/json;charset=utf-8').send(
@@ -253,6 +256,9 @@ async function downloadCollection(req, res) {
                         );
                     }
                 }
+                if (sub.subUserinfo) {
+                    res.set('subscription-userinfo', sub.subUserinfo);
+                }
             }
 
             if (platform === 'JSON') {

backend/src/restful/subscriptions.js

@@ -51,6 +51,11 @@ async function getFlowInfo(req, res) {
         sub.source === 'local' &&
         !['localFirst', 'remoteFirst'].includes(sub.mergeSources)
     ) {
+        if (sub.subUserinfo) {
+            success(res, {
+                ...parseFlowHeaders(sub.subUserinfo),
+            });
+        } else {
             failed(
                 res,
                 new RequestInvalidError(
@@ -59,6 +64,7 @@ async function getFlowInfo(req, res) {
                     `Local subscription ${name} has no flow information!`,
                 ),
             );
+        }
         return;
     }
     try {
@@ -97,6 +103,16 @@ async function getFlowInfo(req, res) {
             );
             return;
         }
+        if (sub.subUserinfo) {
+            success(res, {
+                ...parseFlowHeaders(sub.subUserinfo),
+                remainingDays: getRmainingDays({
+                    resetDay: $arguments.resetDay,
+                    startDate: $arguments.startDate,
+                    cycleDays: $arguments.cycleDays,
+                }),
+            });
+        } else {
             const flowHeaders = await getFlowHeaders(url);
             if (!flowHeaders) {
                 failed(
@@ -117,6 +133,7 @@ async function getFlowInfo(req, res) {
                     cycleDays: $arguments.cycleDays,
                 }),
             });
+        }
     } catch (err) {
         failed(
             res,