fix(plane): fix image upload and curl flag

- nginx: add exact-match location for /uploads (no trailing slash)
  to handle S3 presigned POST URLs from Plane's storage backend
- ct: fix curl -s to curl -fsSL for consistency with other scripts

install/plane-install.sh

@@ -334,6 +334,13 @@ server {
         proxy_set_header X-Forwarded-Proto $scheme;
     }
 
+    location = /uploads {
+        proxy_pass http://plane-minio;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    }
+
     location /uploads/ {
         proxy_pass http://plane-minio;
         proxy_set_header Host $host;