Resolve ai-service directly from the RAG routes, never the gateway

apps/web/app/api/feedback/route.ts

@@ -2,8 +2,13 @@ import { NextResponse } from "next/server";
 
 export const runtime = "nodejs";
 
-const API_GATEWAY_URL =
-  process.env.API_GATEWAY_URL ?? process.env.AI_SERVICE_URL ?? "http://localhost:8000";
+// RAG never goes through api-gateway. The gateway proxies `/auth/*` only --
+// apps/api-gateway/src/proxy/ holds a single AuthProxyController -- so
+// preferring AI_SERVICE_URL here pointed every RAG call at a service with no
+// such route the moment apiGateway was enabled, breaking chat, suggest,
+// history, sections, section-text and feedback at once. Resolve ai-service
+// directly and let AI_SERVICE_URL mean what its name says: auth only.
+const AI_SERVICE_URL = process.env.AI_SERVICE_URL ?? "http://localhost:8000";
 
 export async function POST(request: Request) {
   let traceId: string;
@@ -35,7 +40,7 @@ export async function POST(request: Request) {
     return NextResponse.json({ error: "conversation_id_too_long" }, { status: 400 });
   }
 
-  const base = API_GATEWAY_URL.replace(/\/v1\/rag(?:\/query)?\/?$/, "");
+  const base = AI_SERVICE_URL.replace(/\/v1\/rag(?:\/query)?\/?$/, "");
   try {
     const upstream = await fetch(`${base}/v1/rag/feedback`, {
       method: "POST",