refactor: console improvements — auto-discovery, centralized bootstrap, per-command help

- ConsoleApplication.discoverCommands() scans lib/Console/Commands/ automatically;
  adding a new command no longer requires editing bin/console
- Command base class provides bootstrapApp(), bootstrapModuleApp(), requireBinScript()
  and projectRoot() helpers — eliminates fragile 4-level relative require_once paths
- Per-command --help support via optional usage() method on Command
- Docker-compose scheduler updated to use bin/console scheduler:run
- Old bin scripts now emit deprecation hint to stderr when called directly

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

bin/scheduler-run.php

@@ -9,6 +9,7 @@ use MintyPHP\Service\Scheduler\SchedulerServicesFactory;
 
 require_once __DIR__ . '/cli-bootstrap.php';
 
+fwrite(STDERR, "Hint: prefer `php bin/console scheduler:run` instead.\n");
 $exitCode = 0;
 $startedAt = microtime(true);
 try {