fix(rate-limit): watchdog, env override, and stage tracing to prevent silent wedges (#1828)

Integrated into release/v3.7.7

src/app/api/admin/concurrency/route.ts

@@ -0,0 +1,24 @@
+import { NextResponse } from "next/server";
+import { getAllRateLimitStatus } from "@omniroute/open-sse/services/rateLimitManager.ts";
+import {
+  getStats as getSemaphoreStats,
+  resetAll as resetAllSemaphores,
+} from "@omniroute/open-sse/services/accountSemaphore.ts";
+
+export async function GET() {
+  return NextResponse.json({
+    timestamp: new Date().toISOString(),
+    rateLimits: getAllRateLimitStatus(),
+    semaphores: getSemaphoreStats(),
+  });
+}
+
+export async function POST(request: Request) {
+  const url = new URL(request.url);
+  const action = url.searchParams.get("action");
+  if (action === "reset-semaphores") {
+    resetAllSemaphores();
+    return NextResponse.json({ ok: true, action });
+  }
+  return NextResponse.json({ error: "unknown action" }, { status: 400 });
+}