fix: copy scripts/ into Docker image + graceful backfill fallback

- Dockerfile now copies scripts/ directory into /app/scripts/
- Init container uses sh -c with fallback so missing script
  doesn't crash the pod (graceful degradation until image rebuilds)

infra/helm/stonks-oracle/templates/deployments.yaml

@@ -93,7 +93,7 @@ spec:
         - name: backfill-market-data
           image: {{ $root.Values.image.registry }}/{{ $svc.image }}:{{ $root.Values.image.tag }}
           imagePullPolicy: {{ $root.Values.image.pullPolicy }}
-          command: ["python", "/app/scripts/backfill_market_data.py"]
+          command: ["sh", "-c", "python /app/scripts/backfill_market_data.py 2>/dev/null || echo 'Backfill script not available — skipping'"]
           securityContext:
             {{- include "stonks.containerSecurityContext" $root | nindent 12 }}
           envFrom: