Improve CLI and messages (#26341)

Follow the CLI refactoring

1. Remove the "checkCommandFlags" helper
2. Unify the web startup message, make them have consistent names as `./gitea help`
3. Fine tune some other messages (see the diff)

cmd/main.go

@@ -6,8 +6,6 @@ package cmd
 import (
 	"fmt"
 	"os"
-	"reflect"
-	"strings"
 
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
@@ -58,7 +56,6 @@ func appGlobalFlags() []cli.Flag {
 	return []cli.Flag{
 		// make the builtin flags at the top
 		helpFlag,
-		cli.VersionFlag,
 
 		// shared configuration flags, they are for global and for each sub-command at the same time
 		// eg: such command is valid: "./gitea --config /tmp/app.ini web --config /tmp/app.ini", while it's discouraged indeed
@@ -120,36 +117,6 @@ func prepareWorkPathAndCustomConf(action cli.ActionFunc) func(ctx *cli.Context)
 	}
 }
 
-func reflectGet(v any, fieldName string) any {
-	e := reflect.ValueOf(v).Elem()
-	return e.FieldByName(fieldName).Interface()
-}
-
-// https://cli.urfave.org/migrate-v1-to-v2/#flag-aliases-are-done-differently
-// Sadly v2 doesn't warn you if a comma is in the name. (https://github.com/urfave/cli/issues/1103)
-func checkCommandFlags(c any) bool {
-	var cmds []*cli.Command
-	if app, ok := c.(*cli.App); ok {
-		cmds = app.Commands
-	} else {
-		cmds = c.(*cli.Command).Subcommands
-	}
-	ok := true
-	for _, cmd := range cmds {
-		for _, flag := range cmd.Flags {
-			flagName := reflectGet(flag, "Name").(string)
-			if strings.Contains(flagName, ",") {
-				ok = false
-				log.Error("cli.Flag can't have comma in its Name: %q, use Aliases instead", flagName)
-			}
-		}
-		if !checkCommandFlags(cmd) {
-			ok = false
-		}
-	}
-	return ok
-}
-
 func NewMainApp() *cli.App {
 	app := cli.NewApp()
 	app.EnableBashCompletion = true
@@ -187,6 +154,7 @@ func NewMainApp() *cli.App {
 	app.DefaultCommand = CmdWeb.Name
 
 	globalFlags := appGlobalFlags()
+	app.Flags = append(app.Flags, cli.VersionFlag)
 	app.Flags = append(app.Flags, globalFlags...)
 	app.HideHelp = true // use our own help action to show helps (with more information like default config)
 	app.Before = PrepareConsoleLoggerLevel(log.INFO)
@@ -196,8 +164,5 @@ func NewMainApp() *cli.App {
 	app.Commands = append(app.Commands, subCmdWithConfig...)
 	app.Commands = append(app.Commands, subCmdStandalone...)
 
-	if !checkCommandFlags(app) {
-		panic("some flags are incorrect") // this is a runtime check to help developers
-	}
 	return app
 }