Fix: Conversion complète vers PrimeReact et corrections build

CONVERSIONS UI (8 pages):
✅ Remplacement de tous les composants Shadcn/UI par PrimeReact
- Card, Button, Input, Textarea, Badge → Card, Button, InputText, InputTextarea, Tag
- Conversion de toutes les icônes lucide-react en primeicons

Pages converties:
- app/(main)/aide/page.tsx
- app/(main)/aide/documentation/page.tsx
- app/(main)/aide/tutoriels/page.tsx
- app/(main)/aide/support/page.tsx
- app/(main)/messages/page.tsx
- app/(main)/messages/nouveau/page.tsx
- app/(main)/messages/envoyes/page.tsx
- app/(main)/messages/archives/page.tsx

CORRECTIONS BUILD:
✅ Résolution des conflits de dépendances FullCalendar
- @fullcalendar/core: 6.1.4 → ^6.1.19
- Alignement avec daygrid, timegrid, interaction, react

✅ Correction des erreurs TypeScript
- DataTable: Ajout de selectionMode="multiple"
- InputText number: Conversion number → string avec .toString()

✅ Correction des services API (3 fichiers)
- fournisseurService.ts
- notificationService.ts
- userService.ts
- Remplacement des appels apiService.get() par axios direct
- Ajout du préfixe /api/v1/ à tous les endpoints
- Configuration d'interceptors pour authentication tokens

RÉSULTAT:
✅ Build réussi: 126 pages générées
✅ 0 erreurs de compilation
✅ 0 erreurs TypeScript
✅ Architecture cohérente avec PrimeReact

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

package-lock.json

@@ -8,7 +8,7 @@
       "name": "btpxpress-client",
       "version": "1.0.0",
       "dependencies": {
-        "@fullcalendar/core": "6.1.4",
+        "@fullcalendar/core": "^6.1.19",
         "@fullcalendar/daygrid": "^6.1.4",
         "@fullcalendar/interaction": "^6.1.4",
         "@fullcalendar/react": "^6.1.4",
@@ -116,12 +116,22 @@
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       "license": "MIT",
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-        "preact": "^10.0.5"
+        "preact": "~10.12.1"
+      }
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+    "node_modules/@fullcalendar/core/node_modules/preact": {
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+      "license": "MIT",
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/preact"
       }
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     "node_modules/@fullcalendar/daygrid": {
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     "node_modules/import-fresh": {
@@ -4515,6 +4525,19 @@
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+      "license": "MIT",
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@@ -5051,13 +5074,13 @@
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@@ -6044,19 +6067,6 @@
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