Backport #17598 Backport #17606 Backport #17608 Backport #17609 - Since https://gitea.com/gitea/test-env/pulls/10 the golangci-lint has been upgraded and is erroring about new warnings in the code, this PR fixes those warnings.
* refactor routers directory * move func used for web and api to common * make corsHandler a function to prohibit side efects * rm unused func Co-authored-by: 6543 <6543@obermui.de>