feat: 安全设置展示有效登录会话，支持剔除其它设备

按设备指纹去重并直出 IP；非当前会话可踢下线，对方需重新输入密码。

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/go.mod

@@ -6,7 +6,9 @@ require (
 	github.com/gin-contrib/cors v1.7.2
 	github.com/gin-gonic/gin v1.10.0
 	github.com/golang-jwt/jwt/v5 v5.2.2
+	github.com/gorilla/websocket v1.5.3
 	golang.org/x/crypto v0.43.0
+	golang.org/x/image v0.46.0
 	gopkg.in/ini.v1 v1.67.0
 	gorm.io/driver/postgres v1.5.9
 	gorm.io/gorm v1.25.12
@@ -23,7 +25,6 @@ require (
 	github.com/go-playground/universal-translator v0.18.1 // indirect
 	github.com/go-playground/validator/v10 v10.20.0 // indirect
 	github.com/goccy/go-json v0.10.2 // indirect
-	github.com/gorilla/websocket v1.5.3 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect
 	github.com/jackc/pgx/v5 v5.5.5 // indirect
@@ -41,7 +42,6 @@ require (
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
 	github.com/ugorji/go/codec v1.2.12 // indirect
 	golang.org/x/arch v0.8.0 // indirect
-	golang.org/x/image v0.46.0 // indirect
 	golang.org/x/net v0.45.0 // indirect
 	golang.org/x/sync v0.23.0 // indirect
 	golang.org/x/sys v0.48.0 // indirect