feat: add editable 301 redirects via dedicated panel page

- New "Redirections" page in panel (blueprint + content) with a structure
  field: old URL (text) → target page (pages field, auto-resolves URL)
- error.php controller intercepts 404s, checks redirect map, fires go() 301
- Cache (file driver) invalidated on redirections page update or slug change
- Removed catch-all route that was breaking Kirby multilingual routing

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

site/blueprints/pages/redirections.yml

@@ -0,0 +1,27 @@
+title: Redirections
+icon: link
+
+tabs:
+  content:
+    label: Redirections
+    sections:
+      rules:
+        type: fields
+        fields:
+          rules:
+            label: Règles de redirection (301)
+            type: structure
+            fields:
+              from:
+                label: Ancienne URL
+                type: text
+                required: true
+                placeholder: /BLOG/ancien-slug
+                help: "Chemin relatif (la casse est ignorée)"
+                width: 1/2
+              to:
+                label: Page cible
+                type: pages
+                multiple: false
+                required: true
+                width: 1/2

site/blueprints/pages/white-paper.yml

@@ -58,6 +58,5 @@ tabs:
                 accept: application/pdf
                 translate: false
                 help: Fichier téléchargé après soumission du formulaire
-
   files: tabs/files
   seo: seo/page

site/config/config.php

@@ -12,8 +12,23 @@ return [
 
     'thumbs' => require __DIR__ . '/thumbs.php',
 
+    'cache' => [
+        'redirects' => ['type' => 'file'],
+    ],
+
+    'hooks' => [
+        'page.update:after' => function ($newPage) {
+            if ($newPage->id() === 'redirections') {
+                kirby()->cache('redirects')->remove('map');
+            }
+        },
+        'page.changeSlug:after' => function () {
+            kirby()->cache('redirects')->remove('map');
+        },
+    ],
+
     'routes' => [
-        require(__DIR__ . '/routes/download-white-paper.php')
+        require(__DIR__ . '/routes/download-white-paper.php'),
     ],
 
     'tobimori.seo' => [

site/config/menu.php

@@ -31,7 +31,8 @@ return [
     'a-propos'  => menuItem('a-propos',  'À propos', 'users',  'pages/a-propos'),
     'blog'         => menuItem('blog',         'Blog',          'text', 'pages/blog'),
     'white-papers'    => menuItem('livres-blancs',    'Livres blancs',   'book', 'pages/livres-blancs'),
-    'confidentialite' => menuItem('confidentialite',  'Confidentialité', 'lock', 'pages/policy'),
+    'confidentialite'  => menuItem('confidentialite',  'Confidentialité', 'lock', 'pages/policy'),
+    'redirections'     => menuItem('redirections',     'Redirections',    'url',  'pages/redirections'),
     '-',
     'users',
     'system',

site/controllers/error.php

@@ -0,0 +1,36 @@
+<?php
+
+return function ($kirby, $page, $site) {
+    $path = $kirby->path();
+
+    if (!str_ends_with($path, '.json')) {
+        $normalized = '/' . rtrim(strtolower($path), '/');
+
+        $cache = $kirby->cache('redirects');
+        $map   = $cache->get('map');
+
+        if ($map === null) {
+            $map = [];
+            $redirectsPage = $site->find('redirections');
+            if ($redirectsPage) {
+                foreach ($redirectsPage->rules()->toStructure() as $rule) {
+                    $from = trim($rule->from()->value());
+                    if ($from === '') continue;
+                    $key    = '/' . trim(strtolower($from), '/');
+                    $target = $rule->to()->toPage();
+                    if ($target) {
+                        $map[$key] = $target->url();
+                    }
+                }
+            }
+            $cache->set('map', $map, 1440);
+        }
+
+        if (isset($map[$normalized])) {
+            go($map[$normalized], 301);
+        }
+    }
+
+    $kirby->response()->code(404);
+    return [];
+};