services: disable built-in auth on *arr stack; update readme

Radarr, Sonarr, Prowlarr, and Bazarr now patch their auth setting to
None on every service start — auth is handled by Authelia at the proxy.

Also updates readme with missing services, settings files, and flake
inputs added since the last readme refresh.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

services/prowlarr.nix

@@ -3,7 +3,15 @@
 {
   config = lib.mkIf (config.networking.hostName == "FredOS-Mediaserver") {
     
-    # Sonarr
+    # Disable built-in auth — Authelia handles it at the reverse proxy
+    systemd.services.prowlarr.preStart = lib.mkAfter ''
+      config_file="/var/lib/prowlarr/config.xml"
+      if [ -f "$config_file" ]; then
+        sed -i 's|<AuthenticationMethod>.*</AuthenticationMethod>|<AuthenticationMethod>None</AuthenticationMethod>|' "$config_file"
+      fi
+    '';
+
+    # Prowlarr
     services.prowlarr = {
       enable = true;
       openFirewall = true;