feat(proxy): add proxy pool and per-connection binding + strictProxy support

- Centralize proxy management with reusable proxy pools
- Per-connection proxy binding with legacy fallback
- Add strictProxy option: fail hard instead of silently falling back to direct
- Resolve alicode-intl conflict: keep alicode-intl support + proxy support

Made-with: Cursor

src/app/api/proxy-pools/[id]/test/route.js

@@ -0,0 +1,37 @@
+import { NextResponse } from "next/server";
+import { getProxyPoolById, updateProxyPool } from "@/models";
+import { testProxyUrl } from "@/lib/network/proxyTest";
+
+// POST /api/proxy-pools/[id]/test - Test proxy pool entry
+export async function POST(request, { params }) {
+  try {
+    const { id } = await params;
+    const proxyPool = await getProxyPoolById(id);
+
+    if (!proxyPool) {
+      return NextResponse.json({ error: "Proxy pool not found" }, { status: 404 });
+    }
+
+    const result = await testProxyUrl({ proxyUrl: proxyPool.proxyUrl });
+    const now = new Date().toISOString();
+
+    await updateProxyPool(id, {
+      testStatus: result.ok ? "active" : "error",
+      lastTestedAt: now,
+      lastError: result.ok ? null : (result.error || `Proxy test failed with status ${result.status}`),
+      isActive: result.ok,
+    });
+
+    return NextResponse.json({
+      ok: result.ok,
+      status: result.status,
+      statusText: result.statusText || null,
+      error: result.error || null,
+      elapsedMs: result.elapsedMs || 0,
+      testedAt: now,
+    });
+  } catch (error) {
+    console.log("Error testing proxy pool:", error);
+    return NextResponse.json({ error: "Failed to test proxy pool" }, { status: 500 });
+  }
+}