feat: remove unused plugin version comparison and types, refactor proxy server to support authentication

- Deleted version comparison logic from `pkg/plugin/sign/version.go`.
- Removed unused types and constants from `pkg/plugin/types.go`.
- Updated `pkg/protocol/message.go` to remove plugin-related message types.
- Enhanced `pkg/proxy/http.go` and `pkg/proxy/socks5.go` to include username/password authentication for HTTP and SOCKS5 proxies.
- Modified `pkg/proxy/server.go` to pass authentication parameters to server constructors.
- Added new API endpoint to generate installation commands with a token for clients.
- Created database functions to manage installation tokens in `internal/server/db/install_token.go`.
- Implemented the installation command generation logic in `internal/server/router/handler/install.go`.
- Updated web frontend to support installation command generation and display in `web/src/views/ClientsView.vue`.

cmd/server/main.go

@@ -26,7 +26,6 @@ import (
 	"github.com/gotunnel/internal/server/db"
 	"github.com/gotunnel/internal/server/tunnel"
 	"github.com/gotunnel/pkg/crypto"
-	"github.com/gotunnel/pkg/plugin"
 	"github.com/gotunnel/pkg/version"
 )
 
@@ -80,11 +79,8 @@ func main() {
 		log.Printf("[Server] TLS enabled")
 	}
 
-	// 初始化插件系统（用于客户端 JS 插件管理）
-	registry := plugin.NewRegistry()
-	server.SetPluginRegistry(registry)
-	server.SetJSPluginStore(clientStore) // 设置 JS 插件存储，用于客户端重连时恢复插件
-	server.SetTrafficStore(clientStore)  // 设置流量存储，用于记录流量统计
+	// 设置流量存储，用于记录流量统计
+	server.SetTrafficStore(clientStore)
 
 	// 启动 Web 控制台
 	if cfg.Server.Web.Enabled {