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>

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.21-alpine AS builder
+FROM golang:1.23-alpine AS builder
 
 WORKDIR /app
 COPY go.mod go.sum ./