Refactor HTMX fragment architecture: DRY split into auth endpoints + shared templates

- Created templates/partials/form/_licence.php (shared HTML, no auth logic)
- Created templates/partials/form/_format-website.php (shared HTML, no auth logic)
- Created src/FragmentRenderer.php helper for clean fragment rendering
- Created public/{admin,partage}/fragments/ subdirectories
- Created thin fragment endpoint files: auth guard + data fetch + render template
- Updated all hx-post references in templates to new fragments/ paths
- Updated partage/index.php routing for new fragments subdirectory
- Kept old fragment files as thin delegates for backward compat
- Updated nginx config: added PHP handler in /partage/ location block

app/public/admin/fragments/fichiers.php

@@ -0,0 +1,13 @@
+<?php
+/**
+ * Admin fragment: Format(s) + Fichiers block (HTMX partial).
+ */
+require_once __DIR__ . '/../../../bootstrap.php';
+require_once __DIR__ . '/../../../src/AdminAuth.php';
+App::boot();
+
+AdminAuth::requireLogin();
+
+$_POST['admin_mode'] = '1';
+
+require_once APP_ROOT . '/templates/partials/form/fichiers-fragment.php';

app/public/admin/fragments/format-website.php

@@ -0,0 +1,29 @@
+<?php
+/**
+ * Admin fragment: Site web format fieldset (HTMX partial).
+ */
+require_once __DIR__ . '/../../../bootstrap.php';
+require_once __DIR__ . '/../../../src/AdminAuth.php';
+App::boot();
+
+AdminAuth::requireLogin();
+
+require_once APP_ROOT . '/src/FragmentRenderer.php';
+
+$db = Database::getInstance()->getConnection();
+
+$stmt = $db->prepare('SELECT id FROM format_types WHERE name = ? LIMIT 1');
+$stmt->execute(['Site web']);
+$websiteFormatId = $stmt->fetchColumn();
+
+$selectedFormats = isset($_POST['formats']) && is_array($_POST['formats'])
+    ? array_map('intval', $_POST['formats'])
+    : [];
+
+FragmentRenderer::render('form/_format-website', [
+    'fieldsetId'      => 'edit-website-url-fieldset',
+    'selectedFormats' => $selectedFormats,
+    'websiteFormatId' => $websiteFormatId,
+    'websiteUrl'      => $_POST['website_url']   ?? '',
+    'websiteLabel'    => $_POST['website_label'] ?? '',
+]);

app/public/admin/fragments/language-autre.php

@@ -0,0 +1,9 @@
+<?php
+/**
+ * Admin fragment: language-autre asterisk toggle (HTMX partial).
+ */
+require_once __DIR__ . '/../../../bootstrap.php';
+require_once __DIR__ . '/../../../src/AdminAuth.php';
+AdminAuth::requireLogin();
+
+require_once APP_ROOT . '/public/partage/language-autre-fragment.php';

app/public/admin/fragments/language-search.php

@@ -0,0 +1,10 @@
+<?php
+/**
+ * Admin fragment: language search (HTMX partial).
+ */
+require_once __DIR__ . '/../../../bootstrap.php';
+require_once __DIR__ . '/../../../src/AdminAuth.php';
+AdminAuth::requireLogin();
+App::boot();
+
+require_once APP_ROOT . '/public/partage/language-search-fragment.php';

app/public/admin/fragments/licence.php

@@ -0,0 +1,23 @@
+<?php
+/**
+ * Admin fragment: licence section (HTMX partial).
+ */
+require_once __DIR__ . '/../../../bootstrap.php';
+require_once __DIR__ . '/../../../src/AdminAuth.php';
+AdminAuth::requireLogin();
+
+require_once APP_ROOT . '/src/Database.php';
+require_once APP_ROOT . '/src/FragmentRenderer.php';
+
+$licenseTypes = Database::getInstance()->getAllLicenseTypes();
+
+FragmentRenderer::render('form/_licence', [
+    'adminMode'       => true,
+    'accessTypeId'    => $_POST['access_type_id'] ?? '',
+    'licenseId'       => $_POST['license_id']     ?? '',
+    'licenseCustom'   => $_POST['license_custom'] ?? '',
+    'cc2r'            => !empty($_POST['cc2r']),
+    'wantLicense'     => !empty($_POST['want_license']),
+    'hxPost'          => '/admin/fragments/licence.php',
+    'licenseTypes'    => $licenseTypes,
+]);

app/public/admin/fragments/tag-search.php

@@ -0,0 +1,10 @@
+<?php
+/**
+ * Admin fragment: tag search (HTMX partial).
+ */
+require_once __DIR__ . '/../../../bootstrap.php';
+require_once __DIR__ . '/../../../src/AdminAuth.php';
+AdminAuth::requireLogin();
+App::boot();
+
+require_once APP_ROOT . '/public/partage/tag-search-fragment.php';

app/public/admin/fragments/validate-file.php

@@ -0,0 +1,9 @@
+<?php
+/**
+ * Admin fragment: file validation (HTMX partial).
+ */
+require_once __DIR__ . '/../../../bootstrap.php';
+require_once __DIR__ . '/../../../src/AdminAuth.php';
+AdminAuth::requireLogin();
+
+require_once APP_ROOT . '/src/Controllers/validate-file-fragment-shared.php';