Add vendor contracts master UI and seed data

app/Http/Controllers/Master/VendorController.php

@@ -0,0 +1,63 @@
+<?php
+
+namespace App\Http\Controllers\Master;
+
+use App\Http\Controllers\Controller;
+use App\Models\VendorContract;
+use Illuminate\Http\RedirectResponse;
+use Illuminate\Http\Request;
+use Illuminate\View\View;
+
+class VendorController extends Controller
+{
+    public function index(): View
+    {
+        $contracts = VendorContract::orderBy('vendor_name')->get();
+
+        return view('masters.vendors', [
+            'title' => 'Vendor & Kontrak',
+            'contracts' => $contracts,
+        ]);
+    }
+
+    public function store(Request $request): RedirectResponse
+    {
+        $data = $request->validate([
+            'vendor_name' => ['required', 'string', 'max:255'],
+            'contract_number' => ['nullable', 'string', 'max:255'],
+            'start_date' => ['nullable', 'date'],
+            'end_date' => ['nullable', 'date', 'after_or_equal:start_date'],
+            'sla_response_hours' => ['nullable', 'integer', 'min:0'],
+            'sla_resolution_hours' => ['nullable', 'integer', 'min:0'],
+            'notes' => ['nullable', 'string'],
+        ]);
+
+        VendorContract::create($data);
+
+        return back()->with('success', 'Vendor/kontrak berhasil ditambahkan.');
+    }
+
+    public function update(Request $request, VendorContract $vendor_contract): RedirectResponse
+    {
+        $data = $request->validate([
+            'vendor_name' => ['required', 'string', 'max:255'],
+            'contract_number' => ['nullable', 'string', 'max:255'],
+            'start_date' => ['nullable', 'date'],
+            'end_date' => ['nullable', 'date', 'after_or_equal:start_date'],
+            'sla_response_hours' => ['nullable', 'integer', 'min:0'],
+            'sla_resolution_hours' => ['nullable', 'integer', 'min:0'],
+            'notes' => ['nullable', 'string'],
+        ]);
+
+        $vendor_contract->update($data);
+
+        return back()->with('success', 'Vendor/kontrak berhasil diperbarui.');
+    }
+
+    public function destroy(VendorContract $vendor_contract): RedirectResponse
+    {
+        $vendor_contract->delete();
+
+        return back()->with('success', 'Vendor/kontrak berhasil dihapus.');
+    }
+}