Add multi-tenant SaaS: business signup, owner/branch-manager/staff hierarchy, full tenant isolation

src/app/api/auth/me/route.ts

@@ -2,6 +2,7 @@ import { NextRequest, NextResponse } from "next/server";
 import { connectDb } from "@/lib/server/db";
 import { User } from "@/lib/server/models/User";
 import { Branch } from "@/lib/server/models/Branch";
+import { Business } from "@/lib/server/models/Business";
 import { getAuth } from "@/lib/server/auth";
 
 export const runtime = "nodejs";
@@ -17,11 +18,14 @@ export async function GET(req: NextRequest) {
     return NextResponse.json({ error: "Not authenticated" }, { status: 401 });
   }
   const branch = user.branchId ? await Branch.findById(user.branchId).lean() : null;
+  const business = await Business.findById(user.businessId).lean();
   return NextResponse.json({
     user: {
       id: user._id,
       name: user.name,
       role: user.role,
+      businessId: user.businessId,
+      businessName: business?.name ?? null,
       branchId: user.branchId,
       branchName: branch?.branchName ?? null,
       phoneNumber: user.phoneNumber,