Remove dead code identified by deadcode tool (#37271)

Ran [`deadcode`](https://pkg.go.dev/golang.org/x/tools/cmd/deadcode)
(`-test ./...`) to find functions, methods and error types unreachable
from any call path (including tests), and removed the truly-dead ones.

Co-authored-by: Claude (Opus 4.7) <noreply@anthropic.com>

routers/api/v1/user/gpg_key.go

@@ -281,11 +281,7 @@ func DeleteGPGKey(ctx *context.APIContext) {
 	}
 
 	if err := asymkey_model.DeleteGPGKey(ctx, ctx.Doer, ctx.PathParamInt64("id")); err != nil {
-		if asymkey_model.IsErrGPGKeyAccessDenied(err) {
-			ctx.APIError(http.StatusForbidden, "You do not have access to this key")
-		} else {
-			ctx.APIErrorInternal(err)
-		}
+		ctx.APIErrorInternal(err)
 		return
 	}
 
@@ -295,8 +291,6 @@ func DeleteGPGKey(ctx *context.APIContext) {
 // HandleAddGPGKeyError handle add GPGKey error
 func HandleAddGPGKeyError(ctx *context.APIContext, err error, token string) {
 	switch {
-	case asymkey_model.IsErrGPGKeyAccessDenied(err):
-		ctx.APIError(http.StatusUnprocessableEntity, "You do not have access to this GPG key")
 	case asymkey_model.IsErrGPGKeyIDAlreadyUsed(err):
 		ctx.APIError(http.StatusUnprocessableEntity, "A key with the same id already exists")
 	case asymkey_model.IsErrGPGKeyParsing(err):

routers/web/auth/auth.go

@@ -314,15 +314,6 @@ func SignInPost(ctx *context.Context) {
 			log.Warn("Failed authentication attempt for %s from %s: %v", form.UserName, ctx.RemoteAddr(), err)
 			ctx.Data["Title"] = ctx.Tr("auth.prohibit_login")
 			ctx.HTML(http.StatusOK, "user/auth/prohibit_login")
-		} else if user_model.IsErrUserInactive(err) {
-			if setting.Service.RegisterEmailConfirm {
-				ctx.Data["Title"] = ctx.Tr("auth.active_your_account")
-				ctx.HTML(http.StatusOK, TplActivate)
-			} else {
-				log.Warn("Failed authentication attempt for %s from %s: %v", form.UserName, ctx.RemoteAddr(), err)
-				ctx.Data["Title"] = ctx.Tr("auth.prohibit_login")
-				ctx.HTML(http.StatusOK, "user/auth/prohibit_login")
-			}
 		} else {
 			ctx.ServerError("UserSignIn", err)
 		}

routers/web/auth/linkaccount.go

@@ -105,16 +105,6 @@ func handleSignInError(ctx *context.Context, userName string, ptrForm any, tmpl
 		log.Info("Failed authentication attempt for %s from %s: %v", userName, ctx.RemoteAddr(), err)
 		ctx.Data["Title"] = ctx.Tr("auth.prohibit_login")
 		ctx.HTML(http.StatusOK, "user/auth/prohibit_login")
-	} else if user_model.IsErrUserInactive(err) {
-		ctx.Data["user_exists"] = true
-		if setting.Service.RegisterEmailConfirm {
-			ctx.Data["Title"] = ctx.Tr("auth.active_your_account")
-			ctx.HTML(http.StatusOK, TplActivate)
-		} else {
-			log.Info("Failed authentication attempt for %s from %s: %v", userName, ctx.RemoteAddr(), err)
-			ctx.Data["Title"] = ctx.Tr("auth.prohibit_login")
-			ctx.HTML(http.StatusOK, "user/auth/prohibit_login")
-		}
 	} else {
 		ctx.ServerError(invoker, err)
 	}

routers/web/home.go

@@ -109,9 +109,3 @@ func HomeSitemap(ctx *context.Context) {
 		log.Error("Failed writing sitemap: %v", err)
 	}
 }
-
-// NotFound render 404 page
-func NotFound(ctx *context.Context) {
-	ctx.Data["Title"] = "Page Not Found"
-	ctx.NotFound(nil)
-}

routers/web/org/projects.go

@@ -35,14 +35,6 @@ const (
 	tplProjectsView templates.TplName = "org/projects/view"
 )
 
-// MustEnableProjects check if projects are enabled in settings
-func MustEnableProjects(ctx *context.Context) {
-	if unit.TypeProjects.UnitGlobalDisabled() {
-		ctx.NotFound(nil)
-		return
-	}
-}
-
 // Projects renders the home page of projects
 func Projects(ctx *context.Context) {
 	if _, err := shared_user.RenderUserOrgHeader(ctx); err != nil {

routers/web/shared/actions/runners.go

@@ -362,10 +362,6 @@ func RunnerUpdatePost(ctx *context.Context) {
 	ctx.JSONRedirect("")
 }
 
-func RedirectToDefaultSetting(ctx *context.Context) {
-	ctx.Redirect(ctx.Repo.RepoLink + "/settings/actions/runners")
-}
-
 func findActionsRunner(ctx *context.Context, rCtx *runnersCtx) *actions_model.ActionRunner {
 	runnerID := ctx.PathParamInt64("runnerid")
 	opts := &actions_model.FindRunnerOptions{