fix: resolve PHPStan errors and improve PHPDoc accuracy

src/Config/Config.php

@@ -160,7 +160,7 @@ class Config implements ArrayAccess, IteratorAggregate
     /**
      * Creates an iterator for the configuration options.
      *
-     * @return Traversable Array iterator over configuration
+     * @return \Traversable Array iterator over configuration
      */
     public function getIterator(): \Traversable
     {

src/Exception/MissingConfigurationException.php

@@ -4,8 +4,6 @@ namespace Atlas\Exception;
 
 /**
  * Exception thrown when a required configuration value is missing.
- *
- * @extends \RuntimeException
  */
 class MissingConfigurationException extends \RuntimeException
 {

src/Exception/RouteNotFoundException.php

@@ -7,8 +7,6 @@ namespace Atlas\Exception;
  *
  * This may occur during matching if no route corresponds to the request,
  * or during URL generation if the requested route name is not registered.
- *
- * @extends \RuntimeException
  */
 class RouteNotFoundException extends \RuntimeException
 {

src/Exception/RouteValidationException.php

@@ -4,8 +4,6 @@ namespace Atlas\Exception;
 
 /**
  * Exception thrown when route parameter validation fails.
- *
- * @extends \RuntimeException
  */
 class RouteValidationException extends \RuntimeException
 {

src/Router/RouteGroup.php

@@ -4,8 +4,6 @@ namespace Atlas\Router;
 
 /**
  * Manages groupings of routes for prefix and middleware organization.
- *
- * @implements \IteratorAggregate<array-key, mixed>
  */
 class RouteGroup
 {
@@ -256,9 +254,11 @@ class RouteGroup
     }
 
     /**
-     * Gets all group options.
+     * Registers a module within the group.
      *
-     * @return array Group options configuration
+     * @param string|array $identifier The module identifier or array of identifiers
+     * @param string|null $prefix Optional URI prefix
+     * @return self
      */
     public function module(string|array $identifier, string|null $prefix = null): self
     {
@@ -285,7 +285,7 @@ class RouteGroup
     /**
      * @internal
      */
-    public function getConfig(): Config
+    public function getConfig(): \Atlas\Config\Config
     {
         return $this->router->getConfig();
     }