fix(db): apply additive schema changes on every boot

Migration was gated on a version-bump marker, so new columns added
between releases (task.hidden, user.ban_expires, storage_policies.status)
never reached existing databases and the server failed at first use.

Schema.Create is diff-based and never drops columns by default, so
running it unconditionally is a no-op when the schema matches.

Authored By: TDvorak <info@tdvorak.dev>

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

inventory/client.go

@@ -37,6 +37,11 @@ func InitializeDBClient(l logging.Logger,
 			return nil, fmt.Errorf("failed to migrate database: %w", err)
 		}
 	} else {
+		// Version is current, but additive schema changes (new columns)
+		// still need to reach existing databases between releases.
+		if err := client.Schema.Create(ctx); err != nil {
+			return nil, fmt.Errorf("failed to apply additive schema changes: %w", err)
+		}
 		l.Info("Database schema is up to date.")
 	}