chore(依赖): 同步 Go 模块依赖

更新 go.mod/go.sum 的间接依赖记录
包含 gorm/mysql 相关依赖项

backend/go.mod

@@ -29,6 +29,7 @@ require (
 require (
 	ariga.io/atlas v0.32.1-0.20250325101103-175b25e1c1b9 // indirect
 	dario.cat/mergo v1.0.2 // indirect
+	filippo.io/edwards25519 v1.1.0 // indirect
 	github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 // indirect
 	github.com/Microsoft/go-winio v0.6.2 // indirect
 	github.com/agext/levenshtein v1.2.3 // indirect
@@ -63,6 +64,7 @@ require (
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
 	github.com/go-playground/validator/v10 v10.14.0 // indirect
+	github.com/go-sql-driver/mysql v1.9.0 // indirect
 	github.com/goccy/go-json v0.10.2 // indirect
 	github.com/google/go-cmp v0.7.0 // indirect
 	github.com/google/go-querystring v1.1.0 // indirect
@@ -72,6 +74,8 @@ require (
 	github.com/hashicorp/hcl/v2 v2.18.1 // indirect
 	github.com/icholy/digest v1.1.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/jinzhu/inflection v1.0.0 // indirect
+	github.com/jinzhu/now v1.1.5 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/klauspost/compress v1.18.1 // indirect
 	github.com/klauspost/cpuid/v2 v2.2.4 // indirect
@@ -146,4 +150,7 @@ require (
 	google.golang.org/grpc v1.75.1 // indirect
 	google.golang.org/protobuf v1.36.10 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
+	gorm.io/datatypes v1.2.7 // indirect
+	gorm.io/driver/mysql v1.5.6 // indirect
+	gorm.io/gorm v1.30.0 // indirect
 )