chore: go mod tidy (间接依赖调整)

backend/go.mod

@@ -11,6 +11,7 @@ require (
 	github.com/jackc/pgx/v5 v5.9.2
 	github.com/joho/godotenv v1.5.1
 	github.com/redis/go-redis/v9 v9.19.0
+	go.mongodb.org/mongo-driver/v2 v2.6.0
 	golang.org/x/crypto v0.48.0
 	gorm.io/driver/sqlite v1.5.7
 	gorm.io/gorm v1.26.0
@@ -30,7 +31,6 @@ require (
 	github.com/go-playground/universal-translator v0.18.1 // indirect
 	github.com/go-playground/validator/v10 v10.26.0 // indirect
 	github.com/goccy/go-json v0.10.5 // indirect
-	github.com/google/go-cmp v0.6.0 // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
@@ -53,7 +53,6 @@ require (
 	github.com/xdg-go/scram v1.2.0 // indirect
 	github.com/xdg-go/stringprep v1.0.4 // indirect
 	github.com/youmark/pkcs8 v0.0.0-20240726163527-a2c0da244d78 // indirect
-	go.mongodb.org/mongo-driver/v2 v2.6.0 // indirect
 	go.uber.org/atomic v1.11.0 // indirect
 	golang.org/x/arch v0.15.0 // indirect
 	golang.org/x/net v0.50.0 // indirect