Remove deprecated issues config from golangci-lint

golangci-lint v1.64+ removed max-per-linter and max-same-issues from
the issues section schema. Remove them to pass config validation in CI.

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

.golangci.yml

@@ -1,7 +1,3 @@
-issues:
-  max-per-linter: 0
-  max-same-issues: 0
-
 linters:
   disable-all: true
   enable: