feat(proxy): add outbound HTTP proxy support for OAuth + provider requests

- Patch Node fetch via undici ProxyAgent when HTTP_PROXY/HTTPS_PROXY/ALL_PROXY is set
- Ensure proxy patch is loaded for both chat pipeline and OAuth token exchange
- Add Dashboard Settings → Network to edit outbound proxy and apply immediately
- Persist outbound proxy settings in local db and initialize on server startup
- Move proxy helpers to src/lib/network/ for better structure
- Rename src/proxy.js → src/dashboardGuard.js to avoid naming confusion
- Re-apply proxy env after DB import
- Fix: close old dispatcher on proxy URL change to prevent connection pool leak
- Fix: idempotency guard to avoid patching globalThis.fetch multiple times

Made-with: Cursor

src/app/api/settings/database/route.js

@@ -1,5 +1,6 @@
 import { NextResponse } from "next/server";
-import { exportDb, importDb } from "@/lib/localDb";
+import { exportDb, getSettings, importDb } from "@/lib/localDb";
+import { applyOutboundProxyEnv } from "@/lib/network/outboundProxy";
 
 export async function GET() {
   try {
@@ -15,6 +16,15 @@ export async function POST(request) {
   try {
     const payload = await request.json();
     await importDb(payload);
+
+    // Ensure proxy settings take effect immediately after a DB import.
+    try {
+      const settings = await getSettings();
+      applyOutboundProxyEnv(settings);
+    } catch (err) {
+      console.warn("[Settings][DatabaseImport] Failed to re-apply outbound proxy env:", err);
+    }
+
     return NextResponse.json({ success: true });
   } catch (error) {
     console.log("Error importing database:", error);

src/app/api/settings/proxy-test/route.js

@@ -0,0 +1,23 @@
+import { NextResponse } from "next/server";
+import { testProxyUrl } from "@/lib/network/proxyTest";
+
+export async function POST(request) {
+  try {
+    const body = await request.json();
+    const result = await testProxyUrl({
+      proxyUrl: body?.proxyUrl,
+      testUrl: body?.testUrl,
+      timeoutMs: body?.timeoutMs,
+    });
+
+    if (result?.ok) {
+      return NextResponse.json(result);
+    }
+
+    const status = typeof result?.status === "number" ? result.status : 500;
+    return NextResponse.json({ ok: false, error: result?.error || "Proxy test failed" }, { status });
+  } catch (err) {
+    const message = err?.name === "AbortError" ? "Proxy test timed out" : (err?.message || String(err));
+    return NextResponse.json({ ok: false, error: message }, { status: 500 });
+  }
+}

src/app/api/settings/route.js

@@ -1,5 +1,6 @@
 import { NextResponse } from "next/server";
 import { getSettings, updateSettings } from "@/lib/localDb";
+import { applyOutboundProxyEnv } from "@/lib/network/outboundProxy";
 import bcrypt from "bcryptjs";
 
 export async function GET() {
@@ -53,6 +54,15 @@ export async function PATCH(request) {
     }
 
     const settings = await updateSettings(body);
+
+    // Apply outbound proxy settings immediately (no restart required)
+    if (
+      Object.prototype.hasOwnProperty.call(body, "outboundProxyEnabled") ||
+      Object.prototype.hasOwnProperty.call(body, "outboundProxyUrl") ||
+      Object.prototype.hasOwnProperty.call(body, "outboundNoProxy")
+    ) {
+      applyOutboundProxyEnv(settings);
+    }
     const { password, ...safeSettings } = settings;
     return NextResponse.json(safeSettings);
   } catch (error) {