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fix CI workflow caching by reordering checkout and setup-go steps

- move checkout step before setup-go to enable proper Go module caching
- update actions/checkout to v4 and actions/setup-go to v5
- update golangci-lint-action to v7 with latest version
- migrate golangci-lint config from v1 to v2 format
- fix deprecated comment format for FileServer and FileServerSPA
- remove obsolete golint nolint directive
- remove deprecated go get -v and GO111MODULE env var