feat(ci): GitHub→Forgejo mirror + Forgejo CD pulls from forgejo remote

- .github/workflows/mirror-to-forgejo.yml: on push to main, runner on Mac Mini
  pushes to Forgejo via local SSH (localhost:2222). Keeps Forgejo in sync.
- .forgejo/workflows/cd-macmini.yml: deploy step now pulls from forgejo remote
  (ssh://localhost:2222) instead of GitHub origin.

Flow: local → git push origin main → GitHub → mirror-to-forgejo runs on Mac Mini
      → pushes to Forgejo → Forgejo CD pipeline → deploys containers

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.forgejo/workflows/cd-macmini.yml

@@ -174,7 +174,8 @@ jobs:
       - name: Pull latest code
         run: |
           cd "${{ env.PROJECT_DIR }}"
-          git pull origin main
+          GIT_SSH_COMMAND='ssh -p 2222 -i ~/.ssh/id_ed25519 -o StrictHostKeyChecking=no' \
+            git pull forgejo main
 
       - name: Init deploy tracking
         id: init