Give the AI subsystem one profile table and one collection, read everywhere

Plugin/unraid/api/monitor.php

@@ -100,15 +100,14 @@ vv_api_data();
 //
 // Null on any host that is not the AI host or has AI_ENABLED false, which is also what makes the
 // row absent rather than empty there. Same shape as every other optional subsystem on this page.
+// Reads the shared 'ai' cache the writer maintains and only collects on a miss. Landing here at
+// all already means the monitor cache missed; paying a second full AI collection on top of that
+// would make the slowest request on this page slower still, for figures a background writer
+// refreshed under a minute ago.
 $_vv_ai = null;
 if (vv_ai_ui_on()) {
     require_once dirname(__DIR__) . '/include/ai.php';
-    $_vv_ai = [
-        'model'   => vv_ai_config()['model'],
-        'runtime' => vv_ai_runtime_stats(),
-        'index'   => vv_ai_index_stats(),
-        'tokens'  => vv_ai_token_stats()['today'] ?? null,
-    ];
+    $_vv_ai = vv_ai_monitor_block(vv_ai_stats_cached(isset($_GET['live'])));
 }
 
 echo json_encode([