[#SIRH-6] Faire une doc de type wiki (#14)

| Numéro du ticket | Titre du ticket |
|------------------|-----------------|
|                  |                 |

## Description de la PR

## Modification du .env

## Check list

- [ ] Pas de régression
- [ ] TU/TI/TF rédigée
- [ ] TU/TI/TF OK
- [ ] CHANGELOG modifié

Reviewed-on: #14
Co-authored-by: tristan <tristan@yuno.malio.fr>
Co-committed-by: tristan <tristan@yuno.malio.fr>

frontend/composables/useDocumentation.ts

@@ -0,0 +1,39 @@
+import { documentationSections } from '~/data/documentation-content'
+import type { DocAccessLevel, DocSection } from '~/types/documentation'
+
+const LEVEL_HIERARCHY: Record<DocAccessLevel, number> = {
+  employee: 0,
+  site_manager: 1,
+  admin: 2,
+}
+
+function getUserLevel(roles: string[]): number {
+  if (roles.includes('ROLE_ADMIN') || roles.includes('ROLE_SUPER_ADMIN')) return 2
+  if (roles.includes('ROLE_USER')) return 1
+  return 0
+}
+
+export function useDocumentation() {
+  const auth = useAuthStore()
+  const userLevel = computed(() => getUserLevel(auth.user?.roles ?? []))
+
+  const visibleSections = computed<DocSection[]>(() => {
+    return documentationSections
+      .filter(s => LEVEL_HIERARCHY[s.requiredLevel] <= userLevel.value)
+      .map(s => ({
+        ...s,
+        articles: s.articles.filter(a => LEVEL_HIERARCHY[a.requiredLevel] <= userLevel.value),
+      }))
+      .filter(s => s.articles.length > 0)
+  })
+
+  const activeArticleId = ref<string | null>(null)
+
+  const scrollToArticle = (articleId: string) => {
+    activeArticleId.value = articleId
+    const el = document.getElementById(`doc-${articleId}`)
+    el?.scrollIntoView({ behavior: 'smooth', block: 'start' })
+  }
+
+  return { visibleSections, activeArticleId, scrollToArticle }
+}