fix: Make all() method dynamically check system environment variables

- Update all() to merge internal variables with system environment variables
- Ensures variables set after initialization (e.g., by PHP-FPM) are included
- Internal variables take precedence over system variables
- Fixes issue where RAPIDMAIL_USERNAME and RAPIDMAIL_PASSWORD were missing in all() output

src/Framework/Config/Environment.php

@@ -150,7 +150,61 @@ final readonly class Environment
      */
     public function all(): array
     {
-        return $this->variables;
+        // Merge internal variables with system environment variables
+        // This ensures all available environment variables are returned,
+        // including those that became available after Environment initialization
+        // (e.g., set by PHP-FPM/FastCGI during request processing)
+        $systemVariables = $this->getSystemEnvironment();
+        
+        // Merge: internal variables take precedence over system variables
+        // This ensures variables loaded from .env files or set during initialization
+        // take precedence over system environment variables
+        return array_merge($systemVariables, $this->variables);
+    }
+
+    /**
+     * Get all system environment variables dynamically
+     * 
+     * @return array<string, mixed>
+     */
+    private function getSystemEnvironment(): array
+    {
+        $variables = [];
+
+        // Load from $_ENV (contains dynamically set vars in PHP-FPM)
+        foreach ($_ENV as $key => $value) {
+            if (is_string($key) && is_string($value) && !str_starts_with($key, 'HTTP_')) {
+                $variables[$key] = $value;
+            }
+        }
+
+        // Load from $_SERVER (may contain additional vars from web server)
+        foreach ($_SERVER as $key => $value) {
+            if (!isset($variables[$key]) && 
+                is_string($key) && 
+                is_string($value) && 
+                !str_starts_with($key, 'HTTP_') &&
+                !in_array($key, ['GATEWAY_INTERFACE', 'SERVER_SOFTWARE', 'SERVER_NAME', 'SERVER_ADDR', 
+                                 'SERVER_PORT', 'REQUEST_URI', 'REQUEST_METHOD', 'QUERY_STRING',
+                                 'CONTENT_TYPE', 'CONTENT_LENGTH', 'SCRIPT_NAME', 'SCRIPT_FILENAME',
+                                 'PATH_INFO', 'FCGI_ROLE', 'REDIRECT_STATUS', 'REQUEST_TIME',
+                                 'REQUEST_TIME_FLOAT', 'DOCUMENT_ROOT', 'DOCUMENT_URI',
+                                 'REMOTE_ADDR', 'REMOTE_PORT', 'REMOTE_USER'], true)) {
+                $variables[$key] = $value;
+            }
+        }
+
+        // Load from getenv() as fallback
+        $allEnvVars = getenv();
+        if ($allEnvVars !== false) {
+            foreach ($allEnvVars as $key => $value) {
+                if (!isset($variables[$key])) {
+                    $variables[$key] = $value;
+                }
+            }
+        }
+
+        return $variables;
     }
 
     /**