Implement EMOS scan terminal with REST-only market data

frontend/app/api/scan/terminal/route.ts

@@ -0,0 +1,65 @@
+import { NextRequest, NextResponse } from "next/server";
+import {
+  applyAuthResponseCookies,
+  buildBackendRequestHeaders,
+} from "@/lib/backend-auth";
+
+const API_BASE = process.env.POLYWEATHER_API_BASE_URL;
+
+export async function GET(req: NextRequest) {
+  if (!API_BASE) {
+    return NextResponse.json(
+      { error: "POLYWEATHER_API_BASE_URL is not configured" },
+      { status: 500 },
+    );
+  }
+
+  const params = new URLSearchParams();
+  for (const key of [
+    "scan_mode",
+    "min_price",
+    "max_price",
+    "min_edge_pct",
+    "min_liquidity",
+    "high_liquidity_only",
+    "market_type",
+    "time_range",
+    "limit",
+    "force_refresh",
+  ]) {
+    const value = req.nextUrl.searchParams.get(key);
+    if (value != null && value !== "") {
+      params.set(key, value);
+    }
+  }
+
+  const url = `${API_BASE}/api/scan/terminal?${params.toString()}`;
+
+  try {
+    const auth = await buildBackendRequestHeaders(req);
+    const res = await fetch(url, {
+      headers: auth.headers,
+      cache: "no-store",
+    });
+    if (!res.ok) {
+      const raw = await res.text();
+      const response = NextResponse.json(
+        { error: `Backend returned ${res.status}`, detail: raw.slice(0, 300) },
+        { status: 502 },
+      );
+      return applyAuthResponseCookies(response, auth.response);
+    }
+    const data = await res.json();
+    const response = NextResponse.json(data, {
+      headers: {
+        "Cache-Control": "no-store",
+      },
+    });
+    return applyAuthResponseCookies(response, auth.response);
+  } catch (error) {
+    return NextResponse.json(
+      { error: "Failed to fetch scan terminal data", detail: String(error) },
+      { status: 500 },
+    );
+  }
+}