fix: resolve ineffassign warnings in postgres SearchOptions

The argNum variable tracks parameter positions but the final value is
unused. Added explicit acknowledgment to silence the linter.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/database/postgres.go

@@ -302,7 +302,7 @@ func (s *PostgresStore) GetChildren(ctx context.Context, revisionID int64, paren
 func (s *PostgresStore) SearchOptions(ctx context.Context, revisionID int64, query string, filters SearchFilters) ([]*Option, error) {
 	var baseQuery string
 	var args []interface{}
-	argNum := 1
+	var argNum int
 
 	// If the query looks like an option path (contains dots), prioritize name-based matching.
 	if strings.Contains(query, ".") {
@@ -333,7 +333,7 @@ func (s *PostgresStore) SearchOptions(ctx context.Context, revisionID int64, que
 	if filters.Namespace != "" {
 		baseQuery += fmt.Sprintf(" AND name LIKE $%d", argNum)
 		args = append(args, filters.Namespace+"%")
-		argNum++
+		_ = argNum // silence ineffassign - argNum tracks position but final value unused
 	}
 
 	if filters.HasDefault != nil {