docs(deploy): refresh Sealos deployment option

[yangchuansheng]

Dependency: The live-validated template update is tracked in labring-actions/templates#731. This pull request remains a draft until that change is merged and the published template is verified.

Summary

This PR refreshes the existing Sealos deployment option in the English and
Chinese RSSHub documentation.

It:

• replaces the deprecated template.cloud.sealos.io URL with the current
  Sealos App Store URL
• documents the template's Redis cache, Browserless service, persistent Redis
  storage, and HTTPS endpoint
• keeps the deployment and ecosystem pages synchronized across both languages

Validation

• Sealos template: https://sealos.io/products/app-store/rsshub
• Template source: https://github.com/labring-actions/templates/tree/kb-0.9/template/rsshub
• RSSHub image: diygod/rsshub:2026-07-23
• Tested deployment: 2026-07-24
• Verified: /healthz, cached and uncached routes, Browserless Playwright
  navigation, and Redis integration
• Persistence: KubeBlocks Redis persistent storage
• Documentation build: pnpm run docs:build

Maintenance

I can help maintain the Sealos deployment path and update the documentation when
the RSSHub template or runtime dependencies change.

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