ci: backup DB before every deploy, fix deploy conflict error

- Add "Backup database" step that copies drsousan.db out of the
  running container to /opt/drsousan-backups/ before any container
  changes, keeping the last 10 backups
- Replace --force-recreate (broken on this Docker version) with
  explicit docker stop + docker rm before docker compose up

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.gitea/workflows/ci-cd.yml

@@ -90,6 +90,22 @@ jobs:
         env:
           DOCKER_BUILDKIT: 1
 
+      - name: Backup database
+        run: |
+          BACKUP_DIR="/opt/drsousan-backups"
+          mkdir -p "$BACKUP_DIR"
+          STAMP=$(date +%Y%m%d-%H%M%S)
+          # Copy DB out of volume before any container changes
+          if docker ps -q --filter name=drsousan_api | grep -q .; then
+            docker cp drsousan_api:/data/drsousan.db "$BACKUP_DIR/drsousan-$STAMP.db" && \
+              echo "✅ DB backed up → $BACKUP_DIR/drsousan-$STAMP.db" || \
+              echo "⚠️  DB backup failed (non-fatal)"
+          else
+            echo "ℹ️  Container not running — skipping backup"
+          fi
+          # Keep last 10 backups only
+          ls -t "$BACKUP_DIR"/*.db 2>/dev/null | tail -n +11 | xargs -r rm
+
       - name: Deploy
         run: |
           docker stop drsousan_api 2>/dev/null || true