fix: exclude node_modules from golangci-lint paths

The flatted npm package ships Go source files which causes
golangci-lint to report false positives on node_modules content.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: JAORMX

.golangci.yml

@@ -87,6 +87,7 @@ linters:
       - third_party$
       - builtin$
       - examples$
+      - node_modules$
 formatters:
   enable:
     - gci
@@ -103,3 +104,4 @@ formatters:
       - third_party$
       - builtin$
       - examples$
+      - node_modules$