v2.0.5: Fix E2E flow - proxy, welcome screen, provider sync

Critical fixes:
- Translation proxy now uses system Node.js (not Electron binary)
- Removed duplicate proxy start causing port conflicts
- Added port availability check before spawning proxy
- Fixed welcome:choice double resolve()
- Fixed settings.html close using deprecated remote
- Fixed translationProxy /v1 for openai-compat backends
- Proxy no longer detached/unref - properly tracked as child
- SingletonLock cleanup on startup

Verified E2E:
- Welcome screen on first run ✓
- Provider selection works ✓
- Settings save + sync ✓
- Translation proxy starts correctly ✓
- LS connects to proxy ✓
- --ag-reset works ✓

dist/languageServer.js

@@ -187,7 +187,7 @@ function setupNodeModules(env, modules) {
  */
 const os = require('os');
 function ensureProxyStarted() {
-    return new Promise((resolve) => {
+    return new Promise(async (resolve) => {
         if (_proxyProcess) {
             resolve();
             return;
@@ -234,16 +234,45 @@ function ensureProxyStarted() {
                 models: modelList.map(m => ({ id: m, object: "model", created: 1700000000, owned_by: endpoint.name }))
             };
             fs.writeFileSync(activeConfigPath, JSON.stringify(pcfg, null, 2), 'utf8');
+            // Check if proxy is already running on port 48080
+            const net = require('net');
+            const proxyPortTest = await new Promise((resolve) => {
+                const tester = net.createConnection(48080, '127.0.0.1');
+                tester.on('connect', () => { tester.destroy(); resolve(true); });
+                tester.on('error', () => { tester.destroy(); resolve(false); });
+                setTimeout(() => { tester.destroy(); resolve(false); }, 1000);
+            });
+            if (proxyPortTest) {
+                console.log('[AG X] Translation proxy already running on port 48080, skipping spawn');
+                resolve();
+                return;
+            }
             console.log('[AG X] Starting built-in Node.js translation proxy for:', endpoint.name);
             // Use Electron's built-in Node.js to run our translation proxy
             const proxyScript = path_1.default.join(__dirname, 'services', 'translationProxy.js');
-            const nodeBin = process.execPath;
-            _proxyProcess = (0, child_process_1.spawn)(nodeBin, ['--no-sandbox', proxyScript], {
-                stdio: 'ignore',
-                detached: true,
+            // Use system node (not Electron's process.execPath which starts a GUI)
+            const nodeBin = process.execPath.includes('electron') || process.execPath.includes('AG-X')
+                ? (require('child_process').execSync('which node 2>/dev/null || echo /usr/bin/node').toString().trim())
+                : process.execPath;
+            _proxyProcess = (0, child_process_1.spawn)(nodeBin, [proxyScript], {
+                stdio: ['ignore', 'pipe', 'pipe'],
+                detached: false,
                 env: { ...process.env }
             });
-            _proxyProcess.unref();
+            _proxyProcess.stdout?.on('data', (d) => { 
+                for (const line of d.toString().split('\n')) {
+                    if (line.trim()) console.log('[Proxy]', line.trim());
+                }
+            });
+            _proxyProcess.stderr?.on('data', (d) => {
+                for (const line of d.toString().split('\n')) {
+                    if (line.trim()) console.log('[Proxy:err]', line.trim());
+                }
+            });
+            _proxyProcess.on('exit', (code) => {
+                console.log('[AG X] Translation proxy exited with code:', code);
+                _proxyProcess = null;
+            });
             setTimeout(() => {
                 resolve();
             }, 500);