feat: add session-authed Area + InventoryScan API routes

GET /api/areas, GET /api/inventory-scans, PATCH+DELETE /api/inventory-scans/[id], GET /api/inventory-scans/[id]/photo (proxies Telegram file_id on demand, derives Content-Type from file_path extension since Telegram serves application/octet-stream regardless of actual type).

Co-Authored-By: Claude Sonnet 5 <[email protected]>

src/app/api/areas/route.ts

@@ -0,0 +1,44 @@
+import { NextResponse } from "next/server";
+import { auth } from "@/auth";
+import { createOrGetArea, listAreas, validateCreateAreaInput } from "@/lib/areas";
+
+// Session-authed Area list/create for the review page — mirrors
+// src/app/api/employees/route.ts's pattern. The bot uses the separate
+// bot-secret-authed /api/bot/areas instead (see src/lib/bot-auth.ts).
+export async function GET(): Promise<NextResponse> {
+  const session = await auth();
+  if (!session) {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+  const areas = await listAreas();
+  return NextResponse.json(areas, { status: 200 });
+}
+
+export async function POST(request: Request): Promise<NextResponse> {
+  const session = await auth();
+  if (!session) {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+
+  let body: unknown;
+  try {
+    body = await request.json();
+  } catch {
+    return NextResponse.json({ error: "Request body must be valid JSON" }, { status: 400 });
+  }
+  if (typeof body !== "object" || body === null) {
+    return NextResponse.json({ error: "Request body must be a JSON object" }, { status: 400 });
+  }
+
+  const { name, team } = body as Record<string, unknown>;
+  const validation = validateCreateAreaInput({ name, team });
+  if (!validation.ok) {
+    return NextResponse.json({ error: validation.error }, { status: 400 });
+  }
+
+  const created = await createOrGetArea(validation.value);
+  if (!created.ok) {
+    return NextResponse.json({ error: created.error }, { status: 400 });
+  }
+  return NextResponse.json(created.value, { status: 201 });
+}