ci: unify deploy pipeline - sync to Gitea + self-hosted deploy

- GitHub: CI on ubuntu-latest (no more self-hosted)
- GitHub: add sync-gitea.yml for auto-deploy trigger
- Gitea: add deploy.yml with robust health check
- Remove disabled deploy.yml.disabled

.github/workflows/sync-gitea.yml

@@ -0,0 +1,17 @@
+name: Sync to Gitea
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  sync:
+    name: Push to Gitea
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Push to Gitea
+        run: |
+          git push https://${{ secrets.GITEA_TOKEN }}@git.darkcodex.dev/darkcodex/api-ubigeo.git main --force