fix: increase body size limit for large imports (#43)

- Increase nginx client_max_body_size from 10MB to 50MB
- Add bodyLimit: 50MB to Fastify import route
- Allows importing exports with many base64-encoded images

backend/src/routes/export.ts

@@ -389,6 +389,13 @@ export async function exportRoutes(app: FastifyInstance) {
   // ---------------------------------------------------------------------------
   app.post(
     "/import",
+    {
+      config: {
+        // Increase body limit to 50MB to handle exports with base64 images
+        rawBody: true,
+      },
+      bodyLimit: 50 * 1024 * 1024, // 50 MB
+    },
     async (request, reply) => {
       const userId = await getUserId(request, reply);