feature: integrate Donorbox API for donation management

- Add Donorbox configuration in site/config/config.php with API settings
- Create controller for support page to fetch campaign data from API
- Update support.php template with dynamic donation buttons and gauge
- Transform static buttons into dynamic links with proper URL parameters
- Add JavaScript for tab switching between one-time and monthly donations
- Calculate donation percentage and display real-time campaign stats

The donation buttons now link directly to Donorbox with pre-filled amounts
and intervals. API integration is ready but requires API key configuration.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

site/controllers/support.php

@@ -0,0 +1,55 @@
+<?php
+
+return function($page) {
+    $config = kirby()->option('donorbox');
+    $apiKey = $config['api_key'];
+    $campaignSlug = $config['campaign_slug'];
+
+    // Valeurs par défaut
+    $data = [
+        'amount_raised' => 0,
+        'donor_count' => 0,
+        'goal_amount' => 20000, // Objectif par défaut
+        'percentage' => 0,
+        'campaign_url' => $config['campaign_url']
+    ];
+
+    // Si la clé API est configurée, récupérer les données en temps réel
+    if (!empty($apiKey)) {
+        try {
+            $apiUrl = $config['api_base_url'] . '/campaigns/' . $campaignSlug;
+
+            $ch = curl_init();
+            curl_setopt($ch, CURLOPT_URL, $apiUrl);
+            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+            curl_setopt($ch, CURLOPT_HTTPHEADER, [
+                'Authorization: Bearer ' . $apiKey,
+                'Content-Type: application/json'
+            ]);
+
+            $response = curl_exec($ch);
+            $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
+            curl_close($ch);
+
+            if ($httpCode === 200 && $response) {
+                $campaignData = json_decode($response, true);
+
+                if ($campaignData) {
+                    $data['amount_raised'] = $campaignData['amount_raised'] ?? 0;
+                    $data['donor_count'] = $campaignData['donor_count'] ?? 0;
+                    $data['goal_amount'] = $campaignData['goal_amount'] ?? 20000;
+
+                    // Calculer le pourcentage
+                    if ($data['goal_amount'] > 0) {
+                        $data['percentage'] = round(($data['amount_raised'] / $data['goal_amount']) * 100, 0);
+                    }
+                }
+            }
+        } catch (Exception $e) {
+            // En cas d'erreur, on garde les valeurs par défaut
+            // Optionnel : logger l'erreur
+        }
+    }
+
+    return $data;
+};