docs: add godoc comments to all exported functions and methods

mc/api/offline.go

@@ -4,6 +4,8 @@ import (
 	"github.com/admin-else/strom/mc/crypto"
 )
 
+// NewOfflineAccount creates an offline-mode Account with a UUID derived from the
+// player name. No HTTP calls are made; the UUID is computed locally.
 func NewOfflineAccount(name string) *Account {
 	return &Account{
 		Name: name,