fix: Docker and import issues for CHORUS integration

- Update Dockerfile to use Go 1.23 (was 1.21)
- Add missing config package imports to executor, github integration, and sandbox modules
- These fixes enable proper build for CHORUS Services Docker integration

🤖 Generated with [Claude Code](https://claude.ai/code)

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

sandbox/sandbox.go

@@ -10,6 +10,7 @@ import (
 	"path/filepath"
 	"strings"
 
+	"github.com/anthonyrawlins/bzzz/pkg/config"
 	"github.com/docker/docker/api/types/container"
 	"github.com/docker/docker/client"
 	"github.com/docker/docker/pkg/stdcopy"