fix(SurgeMac): 合并 mihomo 配置覆盖层一次, 避免 GLOBAL 出现重复节点 (#619)

延迟合并 mihomo 配置覆盖层，避免 GLOBAL 共享数组被逐节点追加；同时保留多个节点覆盖层的逐 key 浅合并语义，并补充回归测试。

Author: hhh2210

backend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "sub-store",
-  "version": "2.36.29",
+  "version": "2.36.30",
   "description": "Advanced Subscription Manager for QX, Loon, Surge, Stash and Shadowrocket.",
   "main": "src/main.js",
   "packageManager": "pnpm@11.0.9",

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

@@ -598,6 +598,7 @@ function produce(proxies, targetPlatform, type, opts = {}) {
                             Base64.encode(
                                 JSON.stringify({
                                     ...opts._merged.config,
+                                    ...(opts._merged.configOverride || {}),
                                     'mixed-port': opts.localPort,
                                 }),
                             ),

backend/src/core/proxy-utils/producers/surgemac.js

@@ -206,10 +206,16 @@ function mihomo(proxy, type, opts) {
                 ...clashProxy,
                 name: proxyName,
             });
-            opts._merged.config = {
-                ...opts._merged.config,
-                ...(opts?.config || proxy._config || {}),
-            };
+            // 只记录覆盖层, 在所有节点都并入后由 index.js 统一合并一次.
+            // 若在这里就合并, 覆盖层里的 proxy-groups 会成为后续节点
+            // `proxy-groups[0].proxies.push()` 的目标, 使 GLOBAL 出现重复项.
+            const configOverride = opts?.config || proxy._config;
+            if (configOverride) {
+                opts._merged.configOverride = {
+                    ...(opts._merged.configOverride || {}),
+                    ...configOverride,
+                };
+            }
         } else {
             const external_proxy = {
                 name: proxy.name,

backend/src/test/proxy-producers/text.spec.js

@@ -2067,6 +2067,72 @@ describe('Proxy text producers', function () {
         expect(output).to.not.include('Forced Mihomo=tuic-v5');
     });
 
+    it('merges SurgeMac _config once so GLOBAL lists each merged node once', function () {
+        // A Script Operator naturally builds the override once and assigns the
+        // same object to every node, so the shared reference must survive.
+        const override = {
+            'proxy-groups': [
+                {
+                    name: 'GLOBAL',
+                    type: 'fallback',
+                    proxies: ['20000', '19999', '19998'],
+                    url: 'http://cp.cloudflare.com/generate_204',
+                    interval: 300,
+                },
+            ],
+        };
+        const proxies = ['A', 'B', 'C'].map((name) => ({
+            type: 'trojan',
+            name,
+            server: `${name.toLowerCase()}.example.com`,
+            port: 443,
+            password: 'secret',
+            _merge: true,
+            _mihomoExternal: true,
+            _localPort: 20000,
+            _config: override,
+        }));
+
+        const output = ProxyUtils.produce(proxies, 'SurgeMac', 'external', {});
+
+        const args = [...output.matchAll(/args="([^"]+)"/g)].map((m) => m[1]);
+        const config = JSON.parse(Base64.decode(args[args.length - 1]));
+        const globalGroup = config['proxy-groups'].find(
+            (group) => group.name === 'GLOBAL',
+        );
+
+        expect(globalGroup.proxies).to.deep.equal(['20000', '19999', '19998']);
+        expect(globalGroup.url).to.equal(
+            'http://cp.cloudflare.com/generate_204',
+        );
+        expect(globalGroup.interval).to.equal(300);
+        expect(config.listeners).to.have.lengthOf(3);
+        expect(config.proxies).to.have.lengthOf(3);
+        expect(config['mixed-port']).to.equal(19997);
+    });
+
+    it('keeps earlier SurgeMac _config fields when later nodes add partial overrides', function () {
+        const overrides = [{ 'allow-lan': true }, { 'log-level': 'debug' }, {}];
+        const proxies = ['A', 'B', 'C'].map((name, index) => ({
+            type: 'trojan',
+            name,
+            server: `${name.toLowerCase()}.example.com`,
+            port: 443,
+            password: 'secret',
+            _merge: true,
+            _mihomoExternal: true,
+            _localPort: 20000,
+            _config: overrides[index],
+        }));
+
+        const output = ProxyUtils.produce(proxies, 'SurgeMac', 'external', {});
+        const args = [...output.matchAll(/args="([^"]+)"/g)].map((m) => m[1]);
+        const config = JSON.parse(Base64.decode(args[args.length - 1]));
+
+        expect(config['allow-lan']).to.equal(true);
+        expect(config['log-level']).to.equal('debug');
+    });
+
     it('produces URI WireGuard links with stored and default CIDR suffixes', function () {
         const output = produceExternal('URI', [
             {