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/metrics/metrics.go

@@ -4,7 +4,7 @@ import (
 	"context"
 	"net/http"
 
-	"git.t-juice.club/torjus/oubliette/internal/storage"
+	"code.t-juice.club/torjus/oubliette/internal/storage"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/collectors"
 	"github.com/prometheus/client_golang/prometheus/promhttp"

internal/metrics/metrics_test.go

@@ -8,7 +8,7 @@ import (
 	"strings"
 	"testing"
 
-	"git.t-juice.club/torjus/oubliette/internal/storage"
+	"code.t-juice.club/torjus/oubliette/internal/storage"
 )
 
 func TestNew(t *testing.T) {