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`.

internal/server/router/handler/install.go

@@ -0,0 +1,108 @@
+package handler
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"github.com/gotunnel/internal/server/db"
+)
+
+// InstallHandler 安装处理器
+type InstallHandler struct {
+	app AppInterface
+}
+
+// NewInstallHandler 创建安装处理器
+func NewInstallHandler(app AppInterface) *InstallHandler {
+	return &InstallHandler{app: app}
+}
+
+// GenerateInstallCommandRequest 生成安装命令请求
+type GenerateInstallCommandRequest struct {
+	ClientID string `json:"client_id" binding:"required"`
+}
+
+// InstallCommandResponse 安装命令响应
+type InstallCommandResponse struct {
+	Token       string            `json:"token"`
+	Commands    map[string]string `json:"commands"`
+	ExpiresAt   int64             `json:"expires_at"`
+	ServerAddr  string            `json:"server_addr"`
+}
+
+// GenerateInstallCommand 生成安装命令
+// @Summary 生成客户端安装命令
+// @Tags install
+// @Accept json
+// @Produce json
+// @Param body body GenerateInstallCommandRequest true "客户端ID"
+// @Success 200 {object} InstallCommandResponse
+// @Router /api/install/generate [post]
+func (h *InstallHandler) GenerateInstallCommand(c *gin.Context) {
+	var req GenerateInstallCommandRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	// 生成随机token
+	tokenBytes := make([]byte, 32)
+	if _, err := rand.Read(tokenBytes); err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "生成token失败"})
+		return
+	}
+	token := hex.EncodeToString(tokenBytes)
+
+	// 保存到数据库
+	now := time.Now().Unix()
+	installToken := &db.InstallToken{
+		Token:     token,
+		ClientID:  req.ClientID,
+		CreatedAt: now,
+		Used:      false,
+	}
+
+	store, ok := h.app.GetClientStore().(db.InstallTokenStore)
+	if !ok {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "存储不支持安装token"})
+		return
+	}
+
+	if err := store.CreateInstallToken(installToken); err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "保存token失败"})
+		return
+	}
+
+	// 获取服务器地址
+	serverAddr := fmt.Sprintf("%s:%d", h.app.GetConfig().Server.BindAddr, h.app.GetServer().GetBindPort())
+	if h.app.GetConfig().Server.BindAddr == "" || h.app.GetConfig().Server.BindAddr == "0.0.0.0" {
+		serverAddr = fmt.Sprintf("your-server-ip:%d", h.app.GetServer().GetBindPort())
+	}
+
+	// 生成安装命令
+	expiresAt := now + 3600 // 1小时过期
+	tlsFlag := ""
+	if h.app.GetConfig().Server.TLSDisabled {
+		tlsFlag = " -no-tls"
+	}
+
+	commands := map[string]string{
+		"linux": fmt.Sprintf("curl -fsSL https://raw.githubusercontent.com/gotunnel/gotunnel/main/scripts/install.sh | bash -s -- -s %s -t %s -id %s%s",
+			serverAddr, token, req.ClientID, tlsFlag),
+		"macos": fmt.Sprintf("curl -fsSL https://raw.githubusercontent.com/gotunnel/gotunnel/main/scripts/install.sh | bash -s -- -s %s -t %s -id %s%s",
+			serverAddr, token, req.ClientID, tlsFlag),
+		"windows": fmt.Sprintf("powershell -c \"irm https://raw.githubusercontent.com/gotunnel/gotunnel/main/scripts/install.ps1 | iex; Install-GoTunnel -Server '%s' -Token '%s' -ClientID '%s'%s\"",
+			serverAddr, token, req.ClientID, tlsFlag),
+	}
+
+	c.JSON(http.StatusOK, InstallCommandResponse{
+		Token:      token,
+		Commands:   commands,
+		ExpiresAt:  expiresAt,
+		ServerAddr: serverAddr,
+	})
+}