ci(forgejo): port full CI + CD workflows to Forgejo Actions

- ci.yml: all 10 jobs (security/dockerfile/openspec/typecheck/lint/test/
  build/visual/e2e/image-smoke); drop merge_group, gitleaks via full URL,
  visual-diff PR comment via Forgejo API.
- cd-apps/cd-brouter/cd-infra/cd-staging: drop GitHub Environments, GHCR
  push auth via DEPLOY_GHCR_TOKEN. cd-staging flags Forgejo PR-event and
  peter-evans comment-action risks for validation.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.forgejo/workflows/cd-brouter.yml

@@ -0,0 +1,116 @@
+name: CD BRouter
+# Ported from .github/workflows/cd-brouter.yml for Forgejo Actions.
+# Differences: no `environment: infra`; the image push logs in to ghcr.io
+# with DEPLOY_GHCR_TOKEN (decrypted) instead of the GitHub auto token.
+on:
+  push:
+    branches: [main]
+    paths:
+      - "docker/brouter/**"
+      - "infrastructure/brouter-host/**"
+  workflow_dispatch: {}
+
+concurrency:
+  group: deploy-brouter
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: Build & Push BRouter Image
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+
+      - name: Decrypt secret + login to GHCR
+        run: |
+          curl -sLO https://github.com/getsops/sops/releases/download/v3.9.4/sops-v3.9.4.linux.amd64
+          chmod +x sops-v3.9.4.linux.amd64
+          SOPS_AGE_KEY="${{ secrets.AGE_SECRET_KEY }}" ./sops-v3.9.4.linux.amd64 -d infrastructure/secrets.app.env \
+            | grep '^DEPLOY_GHCR_TOKEN=' | cut -d= -f2- \
+            | docker login ghcr.io -u stigi --password-stdin
+
+      - uses: docker/build-push-action@v7
+        with:
+          context: docker/brouter
+          push: true
+          tags: |
+            ghcr.io/trails-cool/brouter:latest
+            ghcr.io/trails-cool/brouter:${{ github.sha }}
+
+  deploy:
+    name: Deploy BRouter to dedicated host
+    needs: [build]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+
+      - name: Decrypt shared secret
+        id: decrypt
+        run: |
+          curl -sLO https://github.com/getsops/sops/releases/download/v3.9.4/sops-v3.9.4.linux.amd64
+          chmod +x sops-v3.9.4.linux.amd64
+          SOPS_AGE_KEY="${{ secrets.AGE_SECRET_KEY }}" ./sops-v3.9.4.linux.amd64 -d infrastructure/secrets.app.env \
+            | grep '^BROUTER_AUTH_TOKEN=' > infrastructure/brouter-host/.env
+          chmod 0600 infrastructure/brouter-host/.env
+
+          GHCR_TOKEN=$(SOPS_AGE_KEY="${{ secrets.AGE_SECRET_KEY }}" ./sops-v3.9.4.linux.amd64 -d infrastructure/secrets.app.env \
+            | grep '^DEPLOY_GHCR_TOKEN=' | cut -d= -f2-)
+          echo "::add-mask::$GHCR_TOKEN"
+          echo "GHCR_TOKEN=$GHCR_TOKEN" >> $GITHUB_ENV
+
+      - name: Deploy to dedicated host (single SSH connection)
+        env:
+          SSH_KEY: ${{ secrets.BROUTER_DEPLOY_SSH_KEY }}
+          HOST: ${{ secrets.BROUTER_DEPLOY_HOST }}
+          PORT: ${{ secrets.BROUTER_DEPLOY_SSH_PORT }}
+        run: |
+          set -euo pipefail
+
+          install -m 0600 /dev/null ~/id_deploy
+          printf '%s\n' "$SSH_KEY" > ~/id_deploy
+
+          TARBALL_B64=$(tar -C infrastructure/brouter-host -czf - \
+            docker-compose.yml Caddyfile promtail-config.yml \
+            download-segments.sh .env \
+            poi-extract \
+            | base64 -w0)
+
+          ssh -i ~/id_deploy -p "$PORT" \
+            -o StrictHostKeyChecking=accept-new \
+            -o UserKnownHostsFile=/tmp/known_hosts \
+            -o ConnectTimeout=30 \
+            trails@"$HOST" \
+            "TARBALL_B64='$TARBALL_B64' GHCR_TOKEN='$GHCR_TOKEN' bash -s" <<'REMOTE'
+          set -euo pipefail
+          mkdir -p ~/brouter && cd ~/brouter
+          echo "$TARBALL_B64" | base64 -d | tar -xzf -
+          chmod +x download-segments.sh poi-extract/poi-extract.sh poi-extract/to-ndjson.py
+
+          if [ ! -d segments ] || [ -z "$(ls -A segments 2>/dev/null)" ]; then
+            echo "WARNING: segments/ is empty. BRouter will start but return 404 until segments are seeded."
+            mkdir -p segments
+          fi
+
+          echo "$GHCR_TOKEN" | docker login ghcr.io -u stigi --password-stdin
+
+          docker compose pull
+          docker compose up -d --remove-orphans
+          docker compose ps
+          REMOTE
+
+      - name: Annotate deploy in flagship Grafana
+        uses: appleboy/ssh-action@v1
+        with:
+          host: ${{ secrets.DEPLOY_HOST }}
+          username: root
+          key: ${{ secrets.DEPLOY_SSH_KEY }}
+          script: |
+            cd /opt/trails-cool
+            GRAFANA_TOKEN=$(grep GRAFANA_SERVICE_TOKEN .env | cut -d= -f2-)
+            if [ -n "$GRAFANA_TOKEN" ]; then
+              docker compose exec -T grafana curl -sf -X POST \
+                -H "Authorization: Bearer $GRAFANA_TOKEN" \
+                -H "Content-Type: application/json" \
+                -d '{"text":"Deploy brouter ${{ github.sha }}","tags":["deploy","brouter"]}' \
+                http://localhost:3000/api/annotations || true
+            fi