server/slop: package brave-shim and run via user systemd service

hosts/server/slop/brave.nix

@@ -1,5 +1,8 @@
 { pkgs, ... }:
 
+let
+  braveShim = pkgs.callPackage ./brave-shim.nix { };
+in
 {
   # Local Brave API shim as a user service
   systemd.user.services.brave-shim = {
@@ -10,15 +13,7 @@
 
     serviceConfig = {
       Type = "simple";
-      WorkingDirectory = "/home/ocbwoy3/Projects/brave_shim";
-      ExecStart = ''
-        ${pkgs.uv}/bin/uv run \
-          --with fastapi \
-          --with uvicorn \
-          --with ddgs \
-          --with pyyaml \
-          python brave_shim.py
-      '';
+      ExecStart = "${braveShim}/bin/brave-shim";
       Restart = "always";
       RestartSec = "3";
     };