feat: documents légaux upload stable (#126)

Squash develop: correction FK televersePar, droits Docker / volume
/app/documents/legaux pour l’upload PDF admin.

Made-with: Cursor

backend/Dockerfile

@@ -32,8 +32,9 @@ COPY --from=builder /app/dist ./dist
 RUN addgroup -g 1001 -S nodejs
 RUN adduser -S nestjs -u 1001
 
-# Créer le dossier uploads et donner les permissions
-RUN mkdir -p /app/uploads/photos && chown -R nestjs:nodejs /app/uploads
+# Dossiers écriture runtime (nestjs non-root) : photos + documents légaux (PDF)
+RUN mkdir -p /app/uploads/photos /app/documents/legaux && \
+    chown -R nestjs:nodejs /app/uploads /app/documents
 
 USER nestjs