feat: integrate WAHA WhatsApp notifications for tasks, notes, and passwords with admin configuration settings

db.php

@@ -52,3 +52,45 @@ function notify_group($group_id, $message) {
         notify_user($u['user_id'], $message);
     }
 }
+
+function notify_waha($action, $module, $item_name) {
+    global $pdo;
+    try {
+        $u_id = $_SESSION['user_id'] ?? 0;
+        $current_user_name = "System";
+        if($u_id) {
+            $u = get_user($u_id);
+            if($u) $current_user_name = $u['username'];
+        }
+        
+        $stmt = $pdo->query("SELECT waha_endpoint, waha_chat_id, waha_template FROM users WHERE notify_channels LIKE '%whatsapp%' AND waha_endpoint IS NOT NULL AND waha_endpoint != ''");
+        while ($user = $stmt->fetch()) {
+            $endpoint = $user['waha_endpoint'];
+            $chat_id  = $user['waha_chat_id'];
+            $template = $user['waha_template'] ?: "*Update:* {action} on {module} '{item}' by {user}";
+            
+            if(!$endpoint || !$chat_id) continue;
+            
+            $text = str_replace(
+                ['{action}', '{module}', '{item}', '{user}'],
+                [$action, $module, $item_name, $current_user_name],
+                $template
+            );
+            
+            $payload = json_encode([
+                "chatId" => $chat_id,
+                "text" => $text,
+                "session" => "default"
+            ]);
+            
+            $ch = curl_init($endpoint);
+            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+            curl_setopt($ch, CURLOPT_POST, true);
+            curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
+            curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: application/json']);
+            curl_setopt($ch, CURLOPT_TIMEOUT, 1);
+            curl_exec($ch);
+            curl_close($ch);
+        }
+    } catch(Exception $e) {}
+}