Add central CI/CD controller for all Gitea projects

- Webhook-based controller listens for push events from all repos
- Auto-detects Dockerfile, triggers Kaniko build, pushes to registry
- Updates gitops-infra kustomization with new image tag
- Auto-scaffolds gitops environment for new projects
- Ignores non-main branches and repos in ignore list (gitops-infra)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

infrastructure/ci-controller/Dockerfile

@@ -0,0 +1,9 @@
+FROM python:3.12-alpine
+
+RUN apk add --no-cache git curl kubectl
+
+WORKDIR /app
+COPY controller.py .
+
+EXPOSE 8080
+CMD ["python3", "controller.py"]