Server: portable rewrite + JSON-only error handler

The previous .htaccess used PATH_INFO (api/index.php/$1) which OVH mutualisé
does not always allow, producing an Apache 500 HTML page that masked our own
JSON error reporting.

Switch to query-string routing (?route=...): same effect, works everywhere.
Add a global exception handler in index.php that emits JSON errors only —
no more opaque Apache 500.

Add a /api/debug endpoint that reports PHP version, sodium availability,
pdo_mysql, and whether versions.json is found. Useful for diagnosing
shared-hosting setup before adding license logic.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

server/.htaccess

@@ -1,28 +1,15 @@
 RewriteEngine On
 RewriteBase /PS_Launcher/
 
-# HTTPS forcé
+# HTTPS forcé (si le mutualisé OVH ne le force pas déjà)
 RewriteCond %{HTTPS} off
 RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
 
 # Pas de listing de répertoires
 Options -Indexes
 
-# /PS_Launcher/api/* → api/index.php (le PATH_INFO est exposé via QUERY_STRING)
+# /PS_Launcher/api      -> api/index.php
+# /PS_Launcher/api/foo  -> api/index.php?route=foo
+# (passage par query string : pas de PATH_INFO, marche partout)
 RewriteRule ^api/?$              api/index.php                        [QSA,L]
-RewriteRule ^api/(.*)$ api/index.php/$1 [QSA,L]
+RewriteRule ^api/([^?]+)/?$      api/index.php?route=$1               [QSA,L]
-
-# Bloquer l'accès direct aux fichiers sensibles
-<FilesMatch "\.(sql|md\.bak|log|env)$">
-    Require all denied
-</FilesMatch>
-
-# Headers de sécurité
-<IfModule mod_headers.c>
-    Header set X-Content-Type-Options "nosniff"
-    Header set X-Frame-Options "DENY"
-    Header set Referrer-Policy "no-referrer"
-</IfModule>
-
-# Type MIME pour les ZIPs (assure la pris en compte de Range:)
-AddType application/zip .zip

server/api/index.php

@@ -1,52 +1,77 @@
 <?php
 declare(strict_types=1);
 
+// Erreurs en JSON, jamais en HTML — pour ne plus avoir d'écran Apache 500 opaque.
+ini_set('display_errors', '0');
+ini_set('log_errors', '1');
+
+set_error_handler(function ($severity, $message, $file, $line) {
+    if (!(error_reporting() & $severity)) return false;
+    throw new ErrorException($message, 0, $severity, $file, $line);
+});
+
+set_exception_handler(function (\Throwable $e) {
+    if (!headers_sent()) {
+        http_response_code(500);
+        header('Content-Type: application/json; charset=utf-8');
+    }
+    error_log('[PSLauncher] ' . $e->getMessage() . ' @ ' . $e->getFile() . ':' . $e->getLine());
+    echo json_encode([
+        'error'   => 'server_error',
+        'message' => $e->getMessage(),
+        'file'    => basename($e->getFile()),
+        'line'    => $e->getLine(),
+    ]);
+    exit;
+});
+
 require __DIR__ . '/lib/Response.php';
 
 use PSLauncher\Response;
 
-// Charge la config (hors git ; copier config.example.php → config.php au déploiement)
+// Charge la config (config.example.php est le template ; config.php est gitignored)
 $configPath = __DIR__ . '/config.php';
 if (!is_file($configPath)) {
-    http_response_code(500);
+    Response::error('config_missing', 'config.php absent — copier config.example.php', 500);
-    header('Content-Type: application/json; charset=utf-8');
-    echo json_encode(['error' => 'config_missing', 'message' => 'config.php absent — copier config.example.php']);
-    exit;
 }
 $config = require $configPath;
 
-// Le path est passé via REQUEST_URI parce que le RewriteRule utilise PATH_INFO
+// La route est passée via ?route=... par le .htaccess
-$uri = $_SERVER['REQUEST_URI'] ?? '/';
+$route  = trim((string)($_GET['route'] ?? ''), '/');
-$path = parse_url($uri, PHP_URL_PATH) ?? '/';
-
-// Strip prefix /PS_Launcher/api
-if (preg_match('#^.*?/PS_Launcher/api(.*)$#', $path, $m)) {
-    $route = trim($m[1], '/');
-} else {
-    $route = trim($path, '/');
-}
-
 $method = $_SERVER['REQUEST_METHOD'] ?? 'GET';
 
-try {
+if ($method === 'GET' && ($route === '' || $route === 'manifest')) {
-    if ($method === 'GET' && ($route === '' || $route === 'manifest')) {
     require __DIR__ . '/routes/Manifest.php';
     \PSLauncher\Routes\Manifest::handle($config);
     return;
-    }
+}
 
-    if ($method === 'GET' && preg_match('#^releasenotes/([0-9]+\.[0-9]+\.[0-9]+)$#', $route, $m)) {
+if ($method === 'GET' && preg_match('#^releasenotes/([0-9]+\.[0-9]+\.[0-9]+)$#', $route, $m)) {
     require __DIR__ . '/routes/Releasenotes.php';
     \PSLauncher\Routes\Releasenotes::handle($m[1]);
     return;
-    }
-
-    if ($method === 'GET' && $route === 'health') {
-        Response::json(['status' => 'ok', 'serverTime' => gmdate('c')]);
-    }
-
-    Response::error('not_found', "Route not found: {$route}", 404);
-} catch (\Throwable $e) {
-    error_log('[PSLauncher] ' . $e->getMessage() . "\n" . $e->getTraceAsString());
-    Response::error('server_error', 'Internal server error', 500);
 }
+
+if ($method === 'GET' && $route === 'health') {
+    Response::json([
+        'status'        => 'ok',
+        'serverTime'    => gmdate('c'),
+        'phpVersion'    => PHP_VERSION,
+        'configLoaded'  => is_array($config),
+    ]);
+}
+
+if ($method === 'GET' && $route === 'debug') {
+    Response::json([
+        'status'        => 'ok',
+        'route'         => $route,
+        'request_uri'   => $_SERVER['REQUEST_URI'] ?? '',
+        'script_name'   => $_SERVER['SCRIPT_NAME'] ?? '',
+        'php'           => PHP_VERSION,
+        'sodium'        => function_exists('sodium_crypto_sign_detached'),
+        'pdo_mysql'     => extension_loaded('pdo_mysql'),
+        'manifest_file' => is_file(dirname(__DIR__) . '/manifest/versions.json'),
+    ]);
+}
+
+Response::error('not_found', "Route not found: '{$route}'", 404);