ci: add sync-to-gitea workflow

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

@@ -0,0 +1,27 @@
+name: sync-to-gitea
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  sync:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Push to Gitea main
+        env:
+          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
+        run: |
+          echo "Syncing nxtgauge-ai-assistant:main → Gitea main"
+          echo "Commit: $(git rev-parse HEAD)"
+
+          git remote add gitea "https://Admin:${GITEA_TOKEN}@ci.nxtgauge.com/Admin/nxtgauge-ai-assistant.git"
+          git push gitea main:main --force-with-lease
+
+          echo "Sync complete!"