Prompt for token on page load, cap max machines at 2

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

fly.toml

@@ -12,7 +12,7 @@ primary_region = "sjc"
   auto_start_machines = true
   auto_stop_machines = true
   min_machines_running = 0
-  max_machines_running = 10
+  max_machines_running = 2
 
   # Allow 2 concurrent connections so /health can succeed while /convert is running.
   # We enforce "only 1 conversion at a time" in server.js.

server.js

@@ -326,6 +326,9 @@ app.get("/", (_req, res) => {
     return t.trim();
   }
 
+  // Prompt immediately on page load
+  if (!localStorage.getItem(KEY)) getToken();
+
   async function strip(file) {
     const token = getToken();
     if (!token) return;