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/Services/Notifications/EmailNotifier.php

@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Services\Notifications;
+
+use App\Models\NotificationSetting;
+use Illuminate\Support\Facades\Mail;
+
+class EmailNotifier
+{
+    public function sendBatch(NotificationSetting $setting, array $messages): void
+    {
+        $toEmail = $setting->config['to_email'] ?? null;
+
+        if (! $toEmail) {
+            throw new \RuntimeException('Email to_email address is required.');
+        }
+
+        $combined = implode("\n\n---\n\n", $messages);
+
+        Mail::raw($combined, function ($mail) use ($toEmail, $setting): void {
+            $mail->to($toEmail)
+                 ->subject("🐱 KOL Manager — {$setting->name} Notifications");
+        });
+    }
+
+    public function sendTest(NotificationSetting $setting): void
+    {
+        $toEmail = $setting->config['to_email'] ?? null;
+
+        if (! $toEmail) {
+            throw new \RuntimeException('Email to_email address is required.');
+        }
+
+        Mail::raw(
+            "🐱 KOL Manager — Test Notification\n\nYour Email channel is configured correctly! 🎉",
+            function ($mail) use ($toEmail): void {
+                $mail->to($toEmail)->subject('🐱 KOL Manager — Test Notification');
+            }
+        );
+    }
+}

app/Services/Notifications/TelegramNotifier.php

@@ -0,0 +1,50 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Services\Notifications;
+
+use App\Models\NotificationSetting;
+use Illuminate\Support\Facades\Http;
+
+class TelegramNotifier
+{
+    public function sendBatch(NotificationSetting $setting, array $messages): void
+    {
+        foreach ($messages as $message) {
+            $this->send($setting, $message);
+        }
+    }
+
+    public function sendTest(NotificationSetting $setting): void
+    {
+        $this->send(
+            $setting,
+            "🐱 *KOL Manager — Test Notification*\n\nYour Telegram channel is configured correctly! 🎉"
+        );
+    }
+
+    private function send(NotificationSetting $setting, string $text): void
+    {
+        $config   = $setting->config ?? [];
+        $botToken = $config['bot_token'] ?? null;
+        $chatId   = $config['chat_id'] ?? null;
+
+        if (! $botToken || ! $chatId) {
+            throw new \RuntimeException('Telegram bot_token and chat_id are required.');
+        }
+
+        $response = Http::timeout(10)->post(
+            "https://api.telegram.org/bot{$botToken}/sendMessage",
+            [
+                'chat_id'    => $chatId,
+                'text'       => $text,
+                'parse_mode' => 'Markdown',
+            ]
+        );
+
+        if (! $response->successful()) {
+            throw new \RuntimeException('Telegram API error: ' . $response->body());
+        }
+    }
+}

app/Services/Notifications/WahaNotifier.php

@@ -0,0 +1,55 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Services\Notifications;
+
+use App\Models\NotificationSetting;
+use Illuminate\Support\Facades\Http;
+
+/**
+ * WAHA (WhatsApp HTTP API) — self-hosted WhatsApp bridge.
+ * Docs: https://waha.devlike.pro/docs/how-to/send-messages/
+ */
+class WahaNotifier
+{
+    public function sendBatch(NotificationSetting $setting, array $messages): void
+    {
+        foreach ($messages as $message) {
+            $this->send($setting, $message);
+        }
+    }
+
+    public function sendTest(NotificationSetting $setting): void
+    {
+        $this->send(
+            $setting,
+            "🐱 *KOL Manager — Test Notification*\n\nYour WhatsApp channel is configured correctly! 🎉"
+        );
+    }
+
+    private function send(NotificationSetting $setting, string $text): void
+    {
+        $config  = $setting->config ?? [];
+        $url     = rtrim($config['waha_url'] ?? '', '/');
+        $session = $config['waha_session'] ?? 'default';
+        $phone   = $config['phone'] ?? null;
+
+        if (! $url || ! $phone) {
+            throw new \RuntimeException('WAHA waha_url and phone are required.');
+        }
+
+        // Normalise phone: strip non-digits, ensure no leading +
+        $chatId = preg_replace('/[^0-9]/', '', $phone) . '@c.us';
+
+        $response = Http::timeout(15)->post("{$url}/api/sendText", [
+            'session' => $session,
+            'chatId'  => $chatId,
+            'text'    => $text,
+        ]);
+
+        if (! $response->successful()) {
+            throw new \RuntimeException('WAHA API error: ' . $response->body());
+        }
+    }
+}