fix financial and certificates

app/Http/Controllers/Api/Finance/InstallmentPlanController.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Http\Controllers\Api\Finance;
+
+use App\Http\Controllers\Controller;
+use App\Http\Requests\Finance\InstallmentPlanRequest;
+use App\Http\Requests\Finance\PaymentAllocationRequest;
+use App\Services\Finance\InstallmentPlanService;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+
+class InstallmentPlanController extends Controller
+{
+    public function __construct(private InstallmentPlanService $service) {}
+
+    public function index(Request $request): JsonResponse { return response()->json(['ok' => true, 'plans' => $this->service->list($request->query())]); }
+    public function store(InstallmentPlanRequest $request, int $invoice): JsonResponse { return response()->json(['ok' => true, 'plan' => $this->service->createForInvoice($invoice, $request->validated(), optional($request->user())->id)], 201); }
+    public function show(int $plan): JsonResponse { return response()->json(['ok' => true, 'plan' => $this->service->show($plan)]); }
+    public function activate(Request $request, int $plan): JsonResponse { return response()->json(['ok' => true, 'plan' => $this->service->activate($plan, optional($request->user())->id)]); }
+    public function cancel(int $plan): JsonResponse { return response()->json(['ok' => true, 'plan' => $this->service->cancel($plan)]); }
+    public function restructure(InstallmentPlanRequest $request, int $plan): JsonResponse
+    {
+        $old = $this->service->cancel($plan);
+        return response()->json(['ok' => true, 'old_plan' => $old, 'message' => 'Old plan cancelled. Create a replacement plan against the invoice to preserve audit history.']);
+    }
+    public function allocatePayment(PaymentAllocationRequest $request, int $payment): JsonResponse { return response()->json(['ok' => true, 'result' => $this->service->allocatePayment($payment, $request->validated())]); }
+    public function due(): JsonResponse { return response()->json(['ok' => true, 'installments' => $this->service->due(false)]); }
+    public function overdue(): JsonResponse { $this->service->markOverdue(); return response()->json(['ok' => true, 'installments' => $this->service->due(true)]); }
+}