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

Update Go module path and all import references for Gitea to Forgejo
host migration.

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

internal/options/indexer.go

@@ -4,7 +4,7 @@ package options
 import (
 	"context"
 
-	"git.t-juice.club/torjus/labmcp/internal/database"
+	"code.t-juice.club/torjus/labmcp/internal/database"
 )
 
 // IndexResult contains the results of an indexing operation.