feat: add GitOps workflow — branch strategy, PR template, deploy/rollback scripts, CI skeleton

- docs/GITOPS.md: complete workflow from prototype to production
- .gitea/pull_request_template.md: pre-merge checklist for swarm PR review
- scripts/deploy.sh: tag-based deployment to all 6 CTs with health checks
- scripts/rollback.sh: rollback to previous tag
- .gitea/workflows/ci.yml: CI pipeline (activates when Actions runners available)
- .gitignore: prevent config.yaml and secrets from being committed
- .gitattributes: consistent LF line endings across platforms

.gitattributes

@@ -0,0 +1,14 @@
+# Python files: LF
+*.py text eol=lf
+
+# TypeScript/JSON: LF
+*.ts text eol=lf
+*.json text eol=lf
+*.yaml text eol=lf
+*.yml text eol=lf
+
+# Shell scripts: LF
+*.sh text eol=lf
+
+# Docs: LF
+*.md text eol=lf