feat(Middleware): Support ::class syntax in getDependencies()

[usernane]

Feature Request

getDependencies() currently returns an array of middleware name strings. The registry resolves them via MiddlewareManager::getMiddleware($name) which matches against the name passed to the constructor.

This means developers must remember arbitrary string names:

public function getDependencies(): array {
    return ['audit-log', 'start-session']; // magic strings
}

Proposed

Support class name resolution so developers can use ::class:

public function getDependencies(): array {
    return [AuditLogMiddleware::class, StartSessionMiddleware::class];
}

Suggested Implementation

In the dependency resolution step, if a dependency string is a valid class name (contains \\), instantiate or look up the registered instance by class instead of by name:

foreach ($current->getDependencies() as $dep) {
    if (class_exists($dep)) {
        // find registered middleware that is an instance of $dep
        $mw = $this->findByClass($dep);
    } else {
        $mw = $this->getMiddleware($dep);
    }
}

Benefits

• IDE autocompletion and refactoring support
• Compile-time checking (typos caught immediately)
• No need to remember arbitrary name strings
• Both approaches can coexist (string names still work)