minor fixes

.env.example

@@ -78,6 +78,12 @@ VITE_REVERB_SCHEME="${REVERB_SCHEME}"
 # Upload UI feature flag (legacy upload remains default unless explicitly enabled)
 SKINBASE_UPLOADS_V2=false
 
+# Upload transport tuning
+UPLOAD_CHUNK_MAX_BYTES=5242880
+UPLOAD_CHUNK_REQUEST_TIMEOUT_MS=45000
+UPLOAD_RATE_CHUNK_USER=180
+UPLOAD_RATE_CHUNK_IP=360
+
 # Draft abuse prevention controls
 SKINBASE_MAX_DRAFTS=10
 SKINBASE_MAX_DRAFT_STORAGE_MB=1024