fix(migration): add track column to applications table

Migration 005 was already run without track column.
Add it via separate migration 006.

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

Author: ImTotem

alembic/versions/006_application_track.py

@@ -0,0 +1,19 @@
+"""add track column to applications
+
+Revision ID: 006
+Revises: 005
+"""
+
+import sqlalchemy as sa
+from alembic import op
+
+revision = "006"
+down_revision = "005"
+
+
+def upgrade() -> None:
+    op.add_column("applications", sa.Column("track", sa.String))
+
+
+def downgrade() -> None:
+    op.drop_column("applications", "track")