refactor: extract shared code from bin/ scripts and remove legacy scheduler runner

- Extract ModuleManifestLoader for standalone manifest loading (used by
  module-deactivate and ValidateCommand)
- Extract SqlStatementParser, ModuleMigrationRepository, and
  ModuleMigrationService from bin/module-migrate.php to enforce strict
  layering (SQL in repository, orchestration in service)
- Delete bin/scheduler-run.php (fully superseded by bin/console scheduler:run)
- Update docs and test fixtures to reference bin/console

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

docs/reference-benutzer-lifecycle-policy.md

@@ -50,11 +50,11 @@ Automatische Lifecycle-Aktionen ignorieren Benutzer mit mindestens einer aktiven
 ### Cron/CLI
 
 - Bevorzugt über den zentralen Scheduler:
-  - Script: `bin/scheduler-run.php` (führt fällige Jobs aus, inkl. `user_lifecycle_run`)
+  - Kommando: `bin/console scheduler:run` (führt fällige Jobs aus, inkl. `user_lifecycle_run`)
   - Beispiel (minütlich):
 
 ```bash
-* * * * * docker compose exec php php bin/scheduler-run.php
+* * * * * docker compose exec php php bin/console scheduler:run
 ```
 
 Exit-Codes: