refactor: migrate module path from git.t-juice.club to code.t-juice.club

Update Go module path and all import references to reflect the migration
from Gitea (git.t-juice.club) to Forgejo (code.t-juice.club).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

internal/shell/adventure/adventure.go

@@ -8,7 +8,7 @@ import (
 	"strings"
 	"time"
 
-	"git.t-juice.club/torjus/oubliette/internal/shell"
+	"code.t-juice.club/torjus/oubliette/internal/shell"
 )
 
 const sessionTimeout = 10 * time.Minute