fix: 修复 Base64 合法性判断

backend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "sub-store",
-  "version": "2.16.17",
+  "version": "2.16.18",
   "description": "Advanced Subscription Manager for QX, Loon, Surge, Stash and ShadowRocket.",
   "main": "src/main.js",
   "scripts": {

backend/src/core/proxy-utils/preprocessors/index.js

@@ -37,7 +37,7 @@ function Base64Encoded() {
     };
     const parse = function (raw) {
         const decoded = Base64.decode(raw);
-        if (!/^\w+:\/\/\w+/m.test(decoded)) {
+        if (!/^\w+(:\/\/|\s*?=\s*?)\w+/m.test(decoded)) {
             $.error(
                 `Base64 Pre-processor error: decoded line does not start with protocol`,
             );