feat: Add notification services for Email, Telegram, and WhatsApp

- Implement EmailNotifier for sending batch and test notifications via email.
- Implement TelegramNotifier for sending batch and test notifications via Telegram.
- Implement WahaNotifier for sending batch and test notifications via WhatsApp using WAHA API.
- Create migration for client_categories table and update clients table to include category_id.
- Create migration for notification_settings table to manage notification configurations.
- Add ClientCategorySeeder to populate default client categories.
- Create manifest.json for PWA support.
- Implement service worker (sw.js) for caching static assets and offline support.
- Add edit event view for modifying scheduled events.
- Create search results view for displaying search queries.
- Develop notification settings view for configuring notification channels and triggers.

app/Http/Controllers/ClientController.php

@@ -6,25 +6,61 @@ namespace App\Http\Controllers;
 
 use App\Enums\ClientStatus;
 use App\Models\Client;
+use App\Models\ClientCategory;
 use Illuminate\Http\RedirectResponse;
 use Illuminate\Http\Request;
 use Illuminate\View\View;
 
 class ClientController extends Controller
 {
-    public function index(): View
+    private function categoryTree(): \Illuminate\Support\Collection
     {
-        $clients = Client::withCount(['invoices', 'events', 'contentBriefs'])
-            ->latest()
-            ->paginate(12);
+        return ClientCategory::with('children')
+            ->whereNull('parent_id')
+            ->orderBy('sort_order')
+            ->get();
+    }
 
-        return view('clients.index', compact('clients'));
+    private function flatCategories(): \Illuminate\Support\Collection
+    {
+        $flat = collect();
+        foreach ($this->categoryTree() as $parent) {
+            $flat->push($parent);
+            foreach ($parent->children as $child) {
+                $flat->push($child);
+            }
+        }
+        return $flat;
+    }
+
+    public function index(Request $request): View
+    {
+        $query = Client::with('category')
+            ->withCount(['invoices', 'events', 'contentBriefs'])
+            ->latest();
+
+        if ($request->filled('category')) {
+            $query->where('category_id', $request->category);
+        }
+
+        if ($request->filled('status')) {
+            $query->where('status', $request->status);
+        }
+
+        $clients    = $query->paginate(12)->withQueryString();
+        $categories = $this->categoryTree();
+        $statuses   = ClientStatus::cases();
+
+        return view('clients.index', compact('clients', 'categories', 'statuses'));
     }
 
     public function create(): View
     {
-        $statuses = ClientStatus::cases();
-        return view('clients.create', compact('statuses'));
+        $statuses   = ClientStatus::cases();
+        $categories = $this->flatCategories();
+        $categoryTree = $this->categoryTree();
+
+        return view('clients.create', compact('statuses', 'categories', 'categoryTree'));
     }
 
     public function store(Request $request): RedirectResponse
@@ -44,6 +80,7 @@ class ClientController extends Controller
             'postal_code'    => 'nullable|string|max:20',
             'country'        => 'nullable|string|max:100',
             'status'         => 'required|in:active,inactive,prospect',
+            'category_id'    => 'nullable|exists:client_categories,id',
             'notes'          => 'nullable|string',
         ]);
 
@@ -55,18 +92,24 @@ class ClientController extends Controller
 
     public function show(Client $client): View
     {
-        $client->load(['events' => fn ($q) => $q->latest()->limit(5)]);
-        $client->load(['invoices' => fn ($q) => $q->latest()->limit(5)]);
-        $client->load(['contentBriefs' => fn ($q) => $q->latest()->limit(5)]);
-        $client->load(['mediaFiles' => fn ($q) => $q->latest()->limit(10)]);
+        $client->load([
+            'category',
+            'events'       => fn ($q) => $q->latest()->limit(5),
+            'invoices'     => fn ($q) => $q->latest()->limit(5),
+            'contentBriefs'=> fn ($q) => $q->latest()->limit(5),
+            'mediaFiles'   => fn ($q) => $q->latest()->limit(10),
+        ]);
 
         return view('clients.show', compact('client'));
     }
 
     public function edit(Client $client): View
     {
-        $statuses = ClientStatus::cases();
-        return view('clients.edit', compact('client', 'statuses'));
+        $statuses     = ClientStatus::cases();
+        $categories   = $this->flatCategories();
+        $categoryTree = $this->categoryTree();
+
+        return view('clients.edit', compact('client', 'statuses', 'categories', 'categoryTree'));
     }
 
     public function update(Request $request, Client $client): RedirectResponse
@@ -86,6 +129,7 @@ class ClientController extends Controller
             'postal_code'    => 'nullable|string|max:20',
             'country'        => 'nullable|string|max:100',
             'status'         => 'required|in:active,inactive,prospect',
+            'category_id'    => 'nullable|exists:client_categories,id',
             'notes'          => 'nullable|string',
         ]);