fix: add exclude for linting

Author: asleepyskye

backend/.golangci.yml

@@ -0,0 +1,4 @@
+version: "2"
+issues:
+  include:
+    - EXC001

flake.nix

@@ -18,6 +18,7 @@
               pkgs.gnumake
               pkgs.go
               pkgs.nodejs_24
+              pkgs.golangci-lint
             ];
           };
         }