Fix Docker apply crash and add safe profile test flow

Remove invalid _mirror_manager from daemon.json that prevented Docker from starting. Add 2-minute test apply with auto-rollback, final apply confirmation, emergency-restore CLI/UI, and post-restart Docker health checks.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/services/scheduler.py

@@ -6,7 +6,7 @@ from datetime import datetime, timezone
 from app.extensions import db
 from app.models import ApplyLog, Mirror, Profile, ProfileItem, Setting, SystemState
 from app.models import utcnow
-from app.services.applier import apply_profile, rollback_apply
+from app.services.applier import APPLY_MODE_FINAL, apply_profile, rollback_apply
 from app.services.tester import get_best_mirror, test_mirror
 
 logger = logging.getLogger(__name__)
@@ -78,7 +78,7 @@ def run_auto_switch(app) -> None:
 
             item.mirror_id = best.id
             db.session.commit()
-            apply_profile(profile)
+            apply_profile(profile, mode=APPLY_MODE_FINAL)
             _increment_switch_count()
             logger.info("Auto-switched %s to %s", category, best.name)
             break