chore: regenerate readme, database and manifests

After section A of the round 5 audit and the ROCKNIX standalone profiles
(data_root on 58 profiles, 67 display names, three alias folds, 33 core
names mapped, scummvm and vice standalone, yabasanshiro both modes).
Manifests generated twice, identical.

install/nextui.json

@@ -6,7 +6,7 @@
   "platform": "nextui",
   "display_name": "NextUI",
   "version": "1.0",
-  "generated": "2026-10-23T12:47:02Z",
+  "generated": "2026-10-24T00:06:47Z",
   "base_destination": "",
   "detect": [
     {
@@ -61,6 +61,7 @@
       "FBNEOSA"
     ],
     "mednafen_pce_fast": [
+      "beetle-pce-fast",
       "beetle_pce_fast",
       "pce_fast"
     ],