Drop anon gen allowance to 1 to protect the ZeroGPU anon pool

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

static/index.html

@@ -133,7 +133,7 @@
       const [loggedIn, setLoggedIn] = React.useState(null);
       // Anon users get ANON_GEN_LIMIT free gens before being gated to /login.
       // Count persisted in localStorage so it survives reloads.
-      const ANON_GEN_LIMIT = 2;
+      const ANON_GEN_LIMIT = 1;
       const [anonGenCount, setAnonGenCount] = React.useState(() => {
         try { return parseInt(localStorage.getItem('action_anon_count') || '0', 10) || 0; } catch { return 0; }
       });