Integrate Monolog: replace four logging systems with single PSR-3 factory

- Add monolog/monolog dependency (^3.10)  
- Create app/Logger.php central factory with channels: app, admin, error, audit
- Each channel gets RotatingFileHandler (30-day retention) with pass-through LineFormatter
  preserving existing JSON format contracts
- Rewrite AppLogger as thin facade delegating to Logger::get('app')
- Rewrite ErrorHandler::log() to delegate to Logger::get('error')
- Rewrite AdminLogger file output to delegate to Logger::get('admin'), keep DB writes
- Add Monolog file shadow to Audit via Logger::get('audit') (Option A per monolog-plan)
- Log level controlled by LOG_LEVEL env var (defaults: DEBUG in cli-server, WARNING otherwise)
- Graceful NullHandler fallback when log directory is not writable
- Update SystemController LOG_FILES: remove php_error, add app/admin/error/audit
- JSON app logs parsed to readable one-liners in the log viewer
- Remove nginx config tab (parametres + fragment + template + css)
- Friendly empty-state message when app log files don't exist yet (notYet)
- PHP tail fallback when exec() unavailable
- All 228 PHPUnit tests pass, no call sites changed

app/templates/admin/parametres.php

@@ -472,23 +472,10 @@
                 <?= htmlspecialchars($def['label']) ?>
             </a>
             <?php endforeach; ?>
-            <a href="?tab=nginx_config"
-               class="sys-tab <?= $activeTab === 'nginx_config' ? 'active' : '' ?>"
-               hx-get="/admin/system-fragment.php?tab=nginx_config"
-               hx-target="#sys-tab-panel"
-               hx-push-url="?tab=nginx_config"
-               hx-swap="innerHTML"
-               hx-indicator="#sys-tab-panel"
-               data-tab="nginx_config"
-               <?= $activeTab === 'nginx_config' ? 'aria-current="page"' : '' ?>>nginx — config</a>
         </nav>
 
         <div id="sys-tab-panel">
-            <?php if ($activeTab === 'nginx_config'): ?>
-                <?php include APP_ROOT . '/templates/admin/partials/system-nginx-config-panel.php'; ?>
-            <?php else: ?>
-                <?php include APP_ROOT . '/templates/admin/partials/system-log-panel.php'; ?>
-            <?php endif; ?>
+            <?php include APP_ROOT . '/templates/admin/partials/system-log-panel.php'; ?>
         </div>
     </section>
     </article>

app/templates/admin/partials/system-log-panel.php

@@ -19,7 +19,7 @@
 
 <?php if ($logFileMeta): ?>
 <div class="log-meta">
-    <span data-label="Fichier"><?= htmlspecialchars(SystemController::LOG_FILES[$activeTab]['path']) ?></span>
+    <span data-label="Fichier"><?= htmlspecialchars($logFileMeta['path']) ?></span>
     <span data-label="Taille"><?= $logFileMeta['size'] ?></span>
     <span data-label="Modifié"><?= $logFileMeta['mtime'] ?></span>
 </div>
@@ -29,7 +29,7 @@
     <div class="log-unavailable">
         <strong>Journaux non disponibles</strong>
         <div class="log-unavail-path"><?= $logError ?></div>
-        <?php if (php_sapi_name() === 'cli-server'): ?>
+        <?php if (php_sapi_name() === 'cli-server' && str_starts_with($activeTab, 'nginx')): ?>
         <div class="log-unavail-dev">
             En environnement de développement, les logs nginx ne sont pas disponibles.
             Cette page est pleinement fonctionnelle sur le serveur de production.
@@ -37,6 +37,12 @@
         <?php endif; ?>
     </div>
 
+<?php elseif (!empty($notYet)): ?>
+    <div class="log-empty">
+        Aucune entrée pour le moment.<br>
+        <span class="log-unavail-path">Le journal sera créé automatiquement au premier événement.</span>
+    </div>
+
 <?php elseif (empty($logLines)): ?>
     <div class="log-empty">Le fichier journal est vide.</div>
 

app/templates/admin/partials/system-nginx-config-panel.php

@@ -1,40 +0,0 @@
-<?php if ($nginxConfigMeta): ?>
-<div class="log-meta">
-    <span data-label="Fichier"><?= htmlspecialchars($nginxConfigMeta['path']) ?></span>
-    <span data-label="Taille"><?= $nginxConfigMeta['size'] ?></span>
-    <span data-label="Modifié"><?= $nginxConfigMeta['mtime'] ?></span>
-    <?php if ($nginxConfigSource === 'live'): ?>
-    <span class="nginx-source-badge nginx-source-badge--live">● Config déployée</span>
-    <?php else: ?>
-    <span class="nginx-source-badge nginx-source-badge--local">⚠ Référence locale (config live inaccessible)</span>
-    <?php endif; ?>
-</div>
-<?php endif; ?>
-
-<?php if ($nginxConfigError !== null): ?>
-    <div class="log-unavailable">
-        <strong>Configuration nginx non disponible</strong>
-        <div class="log-unavail-path"><?= htmlspecialchars($nginxConfigError) ?></div>
-        <?php if (php_sapi_name() === 'cli-server'): ?>
-        <div class="log-unavail-dev">
-            En développement, <code>/etc/nginx/sites-available/xamxam</code> n'existe pas.
-            La config de référence se trouve dans <code>nginx/xamxam.conf</code>.
-        </div>
-        <?php endif; ?>
-    </div>
-
-<?php elseif (empty($nginxConfigLines)): ?>
-    <div class="log-empty">Le fichier de configuration est vide.</div>
-
-<?php else: ?>
-    <div class="log-output" id="log-output" role="region" aria-label="Configuration nginx">
-        <button class="btn btn--secondary btn--sm log-copy-btn" id="log-copy-btn" type="button" title="Copier la configuration"
-                onclick="copyLogContent(this);return false">
-            Copier
-        </button>
-        <?php foreach ($nginxConfigLines as $i => $line): ?>
-        <span class="log-line <?= SystemController::nginxLineClass($line) ?>"
-              data-n="<?= $i + 1 ?>"><?= htmlspecialchars($line, ENT_QUOTES | ENT_SUBSTITUTE) ?></span>
-        <?php endforeach; ?>
-    </div>
-<?php endif; ?>

app/templates/admin/system.php

@@ -1,114 +0,0 @@
-<main id="main-content">
-    <h1>Système</h1>
-
-    <p class="sys-refresh-note">
-        Affiché le <?= date('d/m/Y à H:i:s') ?> —
-        <a href="?tab=<?= htmlspecialchars($activeTab) ?>&amp;n=<?= $selectedN ?>">Rafraîchir</a> —
-        <a href="?tab=<?= htmlspecialchars($activeTab) ?>&amp;n=<?= $selectedN ?>&amp;refresh=1">Forcer actualisation</a>
-    </p>
-
-    <!-- ════════════════════════════════════════════════════════════════════
-         STATUS SECTION — always visible above tabs
-    ════════════════════════════════════════════════════════════════════ -->
-    <section class="sys-status-section" aria-label="Statut du système">
-        <div class="sys-status-header">
-            <h2 class="srv-section-title srv-section-title--compact">Statut
-                <?php if ($statusCached && $statusCacheAge !== null): ?>
-                <span class="sys-cache-badge sys-cache-badge--hit" title="Données en cache">
-                    ⚡ Cache — il y a <?= $statusCacheAge ?>s
-                </span>
-                <?php else: ?>
-                <span class="sys-cache-badge sys-cache-badge--miss" title="Données fraîches">
-                    ⟳ Actualisé
-                </span>
-                <?php endif; ?>
-            </h2>
-            <button id="sys-status-toggle" class="sys-status-toggle"
-                    aria-expanded="<?= $statusInitiallyCollapsed ? 'false' : 'true' ?>" aria-controls="sys-status-body"
-                    type="button"
-                    onclick="var b=document.getElementById('sys-status-body');var c=b.hidden;b.hidden=!c;this.setAttribute('aria-expanded',c);this.textContent=c?'▲ Réduire':'▼ Développer';document.cookie='sys_collapsed='+(!c)+';path=/;max-age=31536000';return false">
-              <?= $statusInitiallyCollapsed ? '▼ Développer' : '▲ Réduire' ?>
-        </button>
-        </div>
-
-        <div id="sys-status-body"<?= $statusInitiallyCollapsed ? ' hidden' : '' ?>>
-            <div class="srv-grid">
-                <?php foreach ($checks as $check): ?>
-                <?php $st = $check['status'] ?? 'unknown'; ?>
-                <div class="srv-card">
-                    <div class="srv-card__header">
-                        <span class="srv-card__name"><?= htmlspecialchars($check['label']) ?></span>
-                        <span class="<?= SystemController::statusClass($st) ?>"><?= SystemController::statusLabel($st) ?></span>
-                    </div>
-                    <?php if (!empty($check['detail'])): ?>
-                    <div class="srv-card__detail"><?= htmlspecialchars($check['detail']) ?></div>
-                    <?php endif; ?>
-                </div>
-                <?php endforeach; ?>
-            </div>
-
-            <div class="sys-status-meta">
-                <div>
-                    <h3 class="srv-section-title srv-section-title--sub">Environnement PHP</h3>
-                    <div class="php-grid php-grid--flush">
-                        <?php foreach ($phpInfo as $key => $val): ?>
-                        <div class="php-item">
-                            <div class="php-item__key"><?= htmlspecialchars($key) ?></div>
-                            <div class="php-item__val"><?= htmlspecialchars($val) ?></div>
-                        </div>
-                        <?php endforeach; ?>
-                    </div>
-                </div>
-                <div>
-                    <h3 class="srv-section-title srv-section-title--sub">Espace disque</h3>
-                    <div class="disk-bar-wrap">
-                        <div class="disk-bar" style="--disk-pct:<?= $diskPct ?>%;--disk-color:<?= $diskColor ?>"></div>
-                    </div>
-                    <div class="disk-stats">
-                        <span><?= SystemController::humanBytes($diskUsed) ?> utilisé (<?= $diskPct ?>%)</span>
-                        <span><?= SystemController::humanBytes($diskFree) ?> libre / <?= SystemController::humanBytes($diskTotal) ?></span>
-                    </div>
-                </div>
-            </div>
-        </div>
-    </section>
-
-    <!-- ── Tab bar ─────────────────────────────────────────────────────── -->
-    <nav class="sys-tabs" aria-label="Journaux et configuration">
-        <?php foreach (SystemController::LOG_FILES as $key => $def): ?>
-        <a href="?tab=<?= htmlspecialchars($key) ?>&amp;n=<?= $selectedN ?>"
-           class="sys-tab <?= $activeTab === $key ? 'active' : '' ?>"
-           hx-get="/admin/system-fragment.php?tab=<?= htmlspecialchars($key) ?>&amp;n=<?= $selectedN ?>"
-           hx-target="#sys-tab-panel"
-           hx-push-url="?tab=<?= htmlspecialchars($key) ?>&amp;n=<?= $selectedN ?>"
-           hx-swap="innerHTML"
-           hx-indicator="#sys-tab-panel"
-           data-tab="<?= htmlspecialchars($key) ?>"
-           <?= $activeTab === $key ? 'aria-current="page"' : '' ?>>
-            <?= htmlspecialchars($def['label']) ?>
-        </a>
-        <?php endforeach; ?>
-        <a href="?tab=nginx_config"
-           class="sys-tab <?= $activeTab === 'nginx_config' ? 'active' : '' ?>"
-           hx-get="/admin/system-fragment.php?tab=nginx_config"
-           hx-target="#sys-tab-panel"
-           hx-push-url="?tab=nginx_config"
-           hx-swap="innerHTML"
-           hx-indicator="#sys-tab-panel"
-           data-tab="nginx_config"
-           <?= $activeTab === 'nginx_config' ? 'aria-current="page"' : '' ?>>nginx — config</a>
-    </nav>
-
-    <!-- Tab panel — content swapped by HTMX -->
-    <div id="sys-tab-panel">
-
-    <?php if ($activeTab === 'nginx_config'): ?>
-        <?php include APP_ROOT . '/templates/admin/partials/system-nginx-config-panel.php'; ?>
-    <?php else: ?>
-        <?php include APP_ROOT . '/templates/admin/partials/system-log-panel.php'; ?>
-    <?php endif; ?>
-
-    </div><!-- #sys-tab-panel -->
-
-</main>
-<script src="/assets/js/app/admin-logs.js"></script>