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/client/main.go

@@ -7,7 +7,6 @@ import (
 	"github.com/gotunnel/internal/client/config"
 	"github.com/gotunnel/internal/client/tunnel"
 	"github.com/gotunnel/pkg/crypto"
-	"github.com/gotunnel/pkg/plugin"
 	"github.com/gotunnel/pkg/version"
 )
 
@@ -68,14 +67,5 @@ func main() {
 		log.Printf("[Client] TLS enabled")
 	}
 
-	// 初始化插件注册表（用于 JS 插件）
-	registry := plugin.NewRegistry()
-	client.SetPluginRegistry(registry)
-
-	// 初始化版本存储
-	if err := client.InitVersionStore(); err != nil {
-		log.Printf("[Client] Warning: failed to init version store: %v", err)
-	}
-
 	client.Run()
 }