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/module-assets-sync.php

@@ -56,5 +56,6 @@ function moduleAssetsSyncRun(): int
 }
 
 if (PHP_SAPI === 'cli' && realpath((string) ($_SERVER['SCRIPT_FILENAME'] ?? '')) === __FILE__) {
+    fwrite(STDERR, "Hint: prefer `php bin/console module:assets-sync` instead.\n");
     exit(moduleAssetsSyncRun());
 }