fix: increase body limit to 10 GB to prevent upload truncation (#95)

Axum's default body limit for Multipart extraction is 2 MB.
OxiCloud never overrode this default, so any file upload larger
than ~2 MB was silently truncated.

Added DefaultBodyLimit::max(10 GB) both globally on the app
router and specifically on the file upload routes, matching the
chunked upload capability already in place for large files.

src/main.rs

@@ -3,6 +3,7 @@ use std::path::PathBuf;
 use std::sync::Arc;
 
 use axum::Router;
+use axum::extract::DefaultBodyLimit;
 use tower_http::trace::TraceLayer;
 use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 
@@ -153,6 +154,10 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     use oxicloud::interfaces::middleware::redirect::redirect_middleware;
     app = app.layer(axum::middleware::from_fn(redirect_middleware));
     
+    // Increase the default body limit to 10 GB to allow large file uploads.
+    // Without this Axum caps Multipart bodies at 2 MB.
+    app = app.layer(DefaultBodyLimit::max(10 * 1024 * 1024 * 1024));
+    
     // Start server
     let addr = SocketAddr::from(([0, 0, 0, 0], 8086));
     tracing::info!("Starting OxiCloud server on http://{}", addr);