cleanup: remove _write guard — FilePond external API doesn't expose _write

ro=['fire','_read','_write'] is an exclusion list in Ee(), not an inclusion
list. The external pond object has none of these. The only safe interception
point is inside the closure (vendor patch), but the root-cause fix
(fileValidateSizeFilter .filename → .name) already prevents the crash.

app/public/partage/index.php

@@ -22,6 +22,19 @@ $parts = explode('/', $path);
 $slug  = $parts[0] ?? '';
 $action = $parts[1] ?? '';
 
+// Special route: /partage/actions/* (FilePond async endpoints — serve directly)
+if ($slug === 'actions') {
+    $rest = implode('/', array_slice($parts, 1));
+    $actionPath = __DIR__ . '/actions/' . $rest;
+    if (file_exists($actionPath)) {
+        require_once $actionPath;
+    } else {
+        http_response_code(404);
+        exit;
+    }
+    exit;
+}
+
 // Special route: /partage/fragments/* (HTMX fragments under fragments/ subdirectory)
 if ($slug === 'fragments' && $_SERVER['REQUEST_METHOD'] === 'POST') {
     App::boot();