feat(context): GET /api/v1/order-items/[id]/context route

Co-authored-by: Orca <help@stably.ai>

src/app/api/v1/order-items/[id]/context/route.ts

@@ -0,0 +1,35 @@
+import { NextRequest, NextResponse } from "next/server";
+import { getOrderItemContext } from "@/lib/server/order-item-context-service";
+
+export const runtime = "nodejs";
+export const dynamic = "force-dynamic";
+
+/**
+ * GET /api/v1/order-items/[id]/context
+ *
+ * Deterministic SKU-based context for an order_item: last quote,
+ * last order, last invoice checked in, stock state, supplier
+ * history, cheapest. Used by the sprint process modal (L1 inline)
+ * and the orders detail page (L2 popover).
+ *
+ * No Bearer required — matches the existing item-history route's
+ * read-only SKU aggregates pattern. Auth happens upstream at the
+ * page level.
+ */
+export async function GET(
+  _req: NextRequest,
+  { params }: { params: Promise<{ id: string }> },
+) {
+  const { id } = await params;
+  if (!id || typeof id !== "string") {
+    return NextResponse.json({ error: "Missing id" }, { status: 400 });
+  }
+  try {
+    return NextResponse.json(await getOrderItemContext(id));
+  } catch (err) {
+    return NextResponse.json(
+      { error: err instanceof Error ? err.message : "Lookup failed" },
+      { status: 500 },
+    );
+  }
+}