Enable Discovery debug logging for production troubleshooting

- Add DISCOVERY_LOG_LEVEL=debug
- Add DISCOVERY_SHOW_PROGRESS=true
- Temporary changes for debugging InitializerProcessor fixes on production

src/Framework/Config/ConfigValidator.php

@@ -0,0 +1,122 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Framework\Config;
+
+/**
+ * Lightweight boot-time configuration validator.
+ *
+ * Non-invasive: reports issues via error_log and returns a list of problems
+ * without throwing, so existing environments are not broken inadvertently.
+ */
+final readonly class ConfigValidator
+{
+    public function __construct(private Environment $env)
+    {
+    }
+
+    /**
+     * Validate selected environment variables and return a list of issues.
+     * Each issue contains: key, issue, severity, recommendation.
+     */
+    public function validate(): array
+    {
+        $issues = [];
+
+        // APP_ENV validation
+        $allowedEnvs = ['development', 'testing', 'production'];
+        $appEnv = $this->env->getString(EnvKey::APP_ENV, 'production');
+        if (!in_array($appEnv, $allowedEnvs, true)) {
+            $issues[] = [
+                'key' => 'APP_ENV',
+                'issue' => 'invalid_value',
+                'severity' => 'medium',
+                'recommendation' => 'Setze APP_ENV auf einen der Werte: development | testing | production',
+            ];
+        }
+
+        // APP_DEBUG should be boolean-like if present
+        if ($this->env->has(EnvKey::APP_DEBUG)) {
+            $raw = $this->env->get(EnvKey::APP_DEBUG);
+            if (!is_bool($raw) && !is_string($raw)) {
+                $issues[] = [
+                    'key' => 'APP_DEBUG',
+                    'issue' => 'invalid_type',
+                    'severity' => 'low',
+                    'recommendation' => 'APP_DEBUG sollte true/false (oder "true"/"false") sein.',
+                ];
+            }
+        }
+
+        // APP_PORT if present should be a valid TCP port
+        if ($this->env->has('APP_PORT')) {
+            $port = (int) $this->env->get('APP_PORT');
+            if ($port < 1 || $port > 65535) {
+                $issues[] = [
+                    'key' => 'APP_PORT',
+                    'issue' => 'out_of_range',
+                    'severity' => 'medium',
+                    'recommendation' => 'APP_PORT muss zwischen 1 und 65535 liegen.',
+                ];
+            }
+        }
+
+        // Redis port if present
+        if ($this->env->has('REDIS_PORT')) {
+            $redisPort = (int) $this->env->get('REDIS_PORT');
+            if ($redisPort < 1 || $redisPort > 65535) {
+                $issues[] = [
+                    'key' => 'REDIS_PORT',
+                    'issue' => 'out_of_range',
+                    'severity' => 'low',
+                    'recommendation' => 'REDIS_PORT muss zwischen 1 und 65535 liegen.',
+                ];
+            }
+        }
+
+        // Rate limit values if present: must be non-negative
+        foreach ([
+            'RATE_LIMIT_DEFAULT',
+            'RATE_LIMIT_WINDOW',
+            'RATE_LIMIT_AUTH',
+            'RATE_LIMIT_AUTH_WINDOW',
+            'RATE_LIMIT_API',
+            'RATE_LIMIT_API_WINDOW',
+        ] as $rateKey) {
+            if ($this->env->has($rateKey)) {
+                $value = (int) $this->env->get($rateKey);
+                if ($value < 0) {
+                    $issues[] = [
+                        'key' => $rateKey,
+                        'issue' => 'negative_value',
+                        'severity' => 'low',
+                        'recommendation' => $rateKey . ' sollte eine nicht-negative Ganzzahl sein.',
+                    ];
+                }
+            }
+        }
+
+        return $issues;
+    }
+
+    /**
+     * Validate and log issues. Returns the list of issues for optional handling.
+     */
+    public function validateAndReport(): array
+    {
+        $issues = $this->validate();
+        foreach ($issues as $issue) {
+            $msg = sprintf(
+                '[CONFIG] key=%s issue=%s severity=%s recommendation=%s',
+                $issue['key'],
+                $issue['issue'],
+                $issue['severity'],
+                $issue['recommendation']
+            );
+            error_log($msg);
+        }
+
+        return $issues;
+    }
+}