Replace Discord webhook notifications with Matrix (hookshot)

- Add helpers/NotificationHelper.php: shared Matrix webhook sender
  that reads MATRIX_WEBHOOK_URL and MATRIX_NOTIFY_USERS from config
- Remove sendDiscordWebhook() from TicketController; call
  NotificationHelper::sendTicketNotification() instead
- Replace 60-line Discord embed block in create_ticket_api.php
  with a single NotificationHelper call
- config/config.php: DISCORD_WEBHOOK_URL → MATRIX_WEBHOOK_URL +
  new MATRIX_NOTIFY_USERS key (comma-separated Matrix user IDs)
- .env.example: updated env var names and comments

Payload sent to hookshot includes notify_users array so the
JS transform can build proper @mention links for each user.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

controllers/TicketController.php

@@ -7,6 +7,7 @@ require_once dirname(__DIR__) . '/models/UserModel.php';
 require_once dirname(__DIR__) . '/models/WorkflowModel.php';
 require_once dirname(__DIR__) . '/models/TemplateModel.php';
 require_once dirname(__DIR__) . '/helpers/UrlHelper.php';
+require_once dirname(__DIR__) . '/helpers/NotificationHelper.php';
 
 class TicketController {
     private $ticketModel;
@@ -110,8 +111,8 @@ class TicketController {
                     $GLOBALS['auditLog']->logTicketCreate($userId, $result['ticket_id'], $ticketData);
                 }
 
-                // Send Discord webhook notification for new ticket
-                $this->sendDiscordWebhook($result['ticket_id'], $ticketData);
+                // Send Matrix notification for new ticket
+                NotificationHelper::sendTicketNotification($result['ticket_id'], $ticketData, 'manual');
 
                 // Redirect to the new ticket
                 header("Location: " . $GLOBALS['config']['BASE_URL'] . "/ticket/" . $result['ticket_id']);
@@ -195,107 +196,5 @@ class TicketController {
         }
     }
     
-    private function sendDiscordWebhook($ticketId, $ticketData) {
-        $webhookUrl = $GLOBALS['config']['DISCORD_WEBHOOK_URL'] ?? null;
-        if (empty($webhookUrl)) {
-            error_log("Discord webhook URL not configured, skipping webhook for ticket creation");
-            return;
-        }
-
-        // Create ticket URL using validated host
-        $ticketUrl = UrlHelper::ticketUrl($ticketId);
-
-        // Map priorities to Discord colors (matching API endpoint)
-        $priorityColors = [
-            1 => 0xDC3545, // P1 Critical - Red
-            2 => 0xFD7E14, // P2 High - Orange
-            3 => 0x0DCAF0, // P3 Medium - Cyan
-            4 => 0x198754, // P4 Low - Green
-            5 => 0x6C757D  // P5 Info - Gray
-        ];
-
-        // Priority labels for display
-        $priorityLabels = [
-            1 => "P1 - Critical",
-            2 => "P2 - High",
-            3 => "P3 - Medium",
-            4 => "P4 - Low",
-            5 => "P5 - Info"
-        ];
-
-        $priority = (int)($ticketData['priority'] ?? 4);
-        $color = $priorityColors[$priority] ?? 0x6C757D;
-        $priorityLabel = $priorityLabels[$priority] ?? "P{$priority}";
-
-        $title = $ticketData['title'] ?? 'Untitled';
-        $category = $ticketData['category'] ?? 'General';
-        $type = $ticketData['type'] ?? 'Issue';
-        $status = $ticketData['status'] ?? 'Open';
-
-        // Extract hostname from title for cleaner display
-        preg_match('/^\[([^\]]+)\]/', $title, $hostnameMatch);
-        $sourceHost = $hostnameMatch[1] ?? 'Manual';
-
-        $embed = [
-            'title' => 'New Ticket Created',
-            'description' => "**#{$ticketId}** - {$title}",
-            'url' => $ticketUrl,
-            'color' => $color,
-            'fields' => [
-                [
-                    'name' => 'Priority',
-                    'value' => $priorityLabel,
-                    'inline' => true
-                ],
-                [
-                    'name' => 'Category',
-                    'value' => $category,
-                    'inline' => true
-                ],
-                [
-                    'name' => 'Type',
-                    'value' => $type,
-                    'inline' => true
-                ],
-                [
-                    'name' => 'Status',
-                    'value' => $status,
-                    'inline' => true
-                ],
-                [
-                    'name' => 'Source',
-                    'value' => $sourceHost,
-                    'inline' => true
-                ]
-            ],
-            'footer' => [
-                'text' => 'Tinker Tickets | Manual Entry'
-            ],
-            'timestamp' => date('c')
-        ];
-
-        $payload = [
-            'embeds' => [$embed]
-        ];
-
-        // Send webhook
-        $ch = curl_init($webhookUrl);
-        curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: application/json']);
-        curl_setopt($ch, CURLOPT_POST, 1);
-        curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($payload));
-        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
-        curl_setopt($ch, CURLOPT_TIMEOUT, 10);
-
-        $webhookResult = curl_exec($ch);
-        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
-        $curlError = curl_error($ch);
-        curl_close($ch);
-
-        if ($curlError) {
-            error_log("Discord webhook cURL error: {$curlError}");
-        } elseif ($httpCode !== 204 && $httpCode !== 200) {
-            error_log("Discord webhook failed for ticket #{$ticketId}. HTTP Code: {$httpCode}");
-        }
-    }
 }
 ?>