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>

docker-compose.prod.yml

@@ -44,7 +44,7 @@ services:
     depends_on:
       - db
       - memcached
-    command: sh -lc "while true; do php -d display_errors=0 bin/scheduler-run.php || true; sleep 60; done"
+    command: sh -lc "while true; do php -d display_errors=0 bin/console scheduler:run || true; sleep 60; done"
     restart: unless-stopped
 
   db: