docs(node): clarify data store configuration and production requirements

[simone-rahm-uker]

Expands the node-installation docs in the deployment guide to explain the types of data stores and clarify the difference between testing and production setup.

Changes

• node-installation:
  • Added overview of supported data store types (FHIR, S3) and UI-based configuration.
  • Updated bundled data stores section with a critical warning regarding data loss and lack of backups.
  • Added guidance on the requirement for external, production-grade storage.

[coderabbitai]

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