Refactor web package and context package (#25298)

1. The "web" package shouldn't depends on "modules/context" package,
instead, let each "web context" register themselves to the "web"
package.
2. The old Init/Free doesn't make sense, so simplify it
* The ctx in "Init(ctx)" is never used, and shouldn't be used that way
* The "Free" is never called and shouldn't be called because the SSPI
instance is shared

---------

Co-authored-by: Giteabot <teabot@gitea.io>

routers/api/v1/api.go

@@ -64,7 +64,6 @@
 package v1
 
 import (
-	gocontext "context"
 	"fmt"
 	"net/http"
 	"strings"
@@ -705,7 +704,7 @@ func buildAuthGroup() *auth.Group {
 }
 
 // Routes registers all v1 APIs routes to web application.
-func Routes(ctx gocontext.Context) *web.Route {
+func Routes() *web.Route {
 	m := web.NewRoute()
 
 	m.Use(securityHeaders())
@@ -722,13 +721,8 @@ func Routes(ctx gocontext.Context) *web.Route {
 	}
 	m.Use(context.APIContexter())
 
-	group := buildAuthGroup()
-	if err := group.Init(ctx); err != nil {
-		log.Error("Could not initialize '%s' auth method, error: %s", group.Name(), err)
-	}
-
 	// Get user from session if logged in.
-	m.Use(auth.APIAuth(group))
+	m.Use(auth.APIAuth(buildAuthGroup()))
 
 	m.Use(auth.VerifyAuthWithOptionsAPI(&auth.VerifyOptions{
 		SignInRequired: setting.Service.RequireSignInView,