ci(sync): mirror dev branch to Gitea on push

Fusion auto-merges tasks to local dev and pushes to GitHub dev. This
workflow keeps Gitea dev in sync so Coolify's Gitea webhook redeploys
dev.sase.tr.

Flow:
  Fusion task → local dev → github/dev push
                            → this workflow fires
                            → push to gitea/dev (origin)
                            → Coolify webhook → dev.sase.tr deploy

GITEA_PUSH_URL secret holds the authenticated Gitea remote URL.

.github/workflows/sync-dev-to-gitea.yml

@@ -0,0 +1,40 @@
+name: Sync dev → Gitea
+
+# When dev is updated on GitHub (Fusion auto-push or manual), mirror it
+# to Gitea so Coolify's Gitea webhook redeploys dev.sase.tr.
+on:
+  push:
+    branches: [dev]
+  # Allow manual re-sync from the Actions tab
+  workflow_dispatch:
+
+concurrency:
+  group: sync-dev-gitea
+  cancel-in-progress: false
+
+jobs:
+  sync:
+    name: Mirror dev to Gitea
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+
+    steps:
+      - name: Checkout dev (full history)
+        uses: actions/checkout@v4
+        with:
+          ref: dev
+          fetch-depth: 0
+
+      - name: Push to Gitea
+        env:
+          GITEA_PUSH_URL: ${{ secrets.GITEA_PUSH_URL }}
+        run: |
+          set -euo pipefail
+          if [ -z "$GITEA_PUSH_URL" ]; then
+            echo "::error::GITEA_PUSH_URL secret not set"
+            exit 1
+          fi
+          # Fast-forward push; if Gitea has diverged, surface the failure
+          # rather than silently force-overwriting.
+          git push "$GITEA_PUSH_URL" HEAD:refs/heads/dev
+          echo "✓ dev synced to Gitea ($(git rev-parse --short HEAD))"