feat: plugin analytics avec custom field kirbyup + Chart.js

Refactoring complet du plugin analytics : remplacement de la section
avec template Vue inline par un custom field compilé avec kirbyup.
Dashboard avec KPIs, line chart Chart.js et filtres par date.

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

public/site/plugins/analytics/classes/AnalyticsPage.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace adrienpayet\analytics;
+
+use Kirby\Cms\Page;
+
+class AnalyticsPage extends Page
+{
+    public function getAnalyticsData(array $filters = []): array
+    {
+        $user = kirby()->user();
+
+        if (!$user) {
+            return [];
+        }
+
+        if ($user->isAdmin()) {
+            return AnalyticsStore::getAggregatedData($filters);
+        }
+
+        $allowedProjects = $user->currentProjects();
+        $allowedEmails = [];
+        foreach ($allowedProjects as $project) {
+            $users = kirby()->users();
+            foreach ($users as $u) {
+                if ($u->currentProjects()->has($project)) {
+                    $allowedEmails[] = $u->email()->value();
+                }
+            }
+        }
+
+        $filters['emails'] = array_unique($allowedEmails);
+
+        return AnalyticsStore::getAggregatedData($filters);
+    }
+
+}