fix: alembic migration chain 025→026 (down_revision mismatch)

025_module_toggles pointed to '024_bot_trades_released_at' but 024's
revision ID is just '024'. 026 pointed to '025' but 025's ID is
'025_module_toggles'. Both breaks caused 'alembic upgrade head' to
fail with KeyError on any fresh Postgres install — a launch blocker.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

alembic/versions/025_module_toggles.py

@@ -8,7 +8,7 @@ from alembic import op
 import sqlalchemy as sa
 
 revision = '025_module_toggles'
-down_revision = '024_bot_trades_released_at'
+down_revision = '024'
 branch_labels = None
 depends_on = None