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Add multi-lingual FHIR support docs and demo app (#9417)

* Add multi-lingual FHIR support docs and demo app

- Add docs/fhir-datastore/multilingual-support.md covering the FHIR
  translation extension (http://hl7.org/fhir/StructureDefinition/translation)
  with examples for Questionnaire items, Coding display strings, clinical
  notes, and Patient.communication preferred language
- Add examples/medplum-multilingual-demo — a Vite/React app demonstrating
  the translation extension end-to-end: multilingual intake Questionnaire,
  translated SNOMED Conditions, QuestionnaireResponse with language field,
  and patient preferred language detection
- Wire the new doc into the FHIR Datastore sidebar under FHIR Data

Signed-off-by: Ian Plunkett <1857868+ianplunkett@users.noreply.github.com>

* docs: address PR feedback — clarify translation vs CodeSystem searchability, fix spelling

- Add "Searchable?" column to the comparison table so it's explicit that
  the translation extension is for display only and does not affect FHIR
  search, while CodeSystem.designation + ValueSet/\$expand supports
  language-aware code lookups
- Add a "Key difference" callout explaining when each mechanism applies
- Rename "Multi-lingual" → "Multilingual" throughout the demo app

Signed-off-by: Ian Plunkett <ian@medplum.com>
Signed-off-by: Ian Plunkett <1857868+ianplunkett@users.noreply.github.com>

* chore: sync package-lock.json with latest main

Rebase onto main and regenerate the lock file so npm ci passes on CI.

Signed-off-by: Ian Plunkett <ian@medplum.com>
Signed-off-by: Ian Plunkett <1857868+ianplunkett@users.noreply.github.com>

* docs: simplify getTranslation signature per PR feedback

Take (parent, elementName, lang) instead of (primaryValue, shadowElement, lang)
so callers pass the parent object and field name — the function reads both
parent[elementName] and parent['_'+elementName] itself, which is simpler at
the call site.

Signed-off-by: Ian Plunkett <ian@medplum.co... (continued)

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