✨ feat(frontend): 升级 DataGrid 组件并引入高性能拖拽交互

- 实现基于原生 DOM 事件的零渲染列宽拖拽，彻底解决卡顿与误触排序问题
- 查询编辑器集成 DataGrid，支持 SQL 结果直接编辑与事务提交
- 侧边栏新增上下文感知的 "新建查询" 快捷入口
- 优化 TabManager 渲染逻辑与全局布局，消除不必要的滚动条

internal/ssh/ssh.go

@@ -0,0 +1,70 @@
+package ssh
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"os"
+	"time"
+
+	"GoNavi-Wails/internal/connection"
+
+	"github.com/go-sql-driver/mysql"
+	"golang.org/x/crypto/ssh"
+)
+
+// ViaSSHDialer registers a custom network for MySQL that proxies through SSH
+type ViaSSHDialer struct {
+	sshClient *ssh.Client
+}
+
+func (d *ViaSSHDialer) Dial(ctx context.Context, addr string) (net.Conn, error) {
+	return d.sshClient.Dial("tcp", addr)
+}
+
+// connectSSH establishes an SSH connection and returns a Dialer
+func connectSSH(config connection.SSHConfig) (*ssh.Client, error) {
+	authMethods := []ssh.AuthMethod{}
+
+	if config.KeyPath != "" {
+		key, err := os.ReadFile(config.KeyPath)
+		if err == nil {
+			signer, err := ssh.ParsePrivateKey(key)
+			if err == nil {
+				authMethods = append(authMethods, ssh.PublicKeys(signer))
+			}
+		}
+	}
+	
+	if config.Password != "" {
+		authMethods = append(authMethods, ssh.Password(config.Password))
+	}
+
+	sshConfig := &ssh.ClientConfig{
+		User:            config.User,
+		Auth:            authMethods,
+		HostKeyCallback: ssh.InsecureIgnoreHostKey(), // Use strict checking in production!
+		Timeout:         5 * time.Second,
+	}
+
+	addr := fmt.Sprintf("%s:%d", config.Host, config.Port)
+	return ssh.Dial("tcp", addr, sshConfig)
+}
+
+// RegisterSSHNetwork registers a unique network name for a specific SSH tunnel
+// Returns the network name to use in DSN
+func RegisterSSHNetwork(sshConfig connection.SSHConfig) (string, error) {
+	client, err := connectSSH(sshConfig)
+	if err != nil {
+		return "", err
+	}
+
+	// Generate unique network name
+	netName := fmt.Sprintf("ssh_%s_%d", sshConfig.Host, time.Now().UnixNano())
+	
+	mysql.RegisterDialContext(netName, func(ctx context.Context, addr string) (net.Conn, error) {
+		return client.Dial("tcp", addr)
+	})
+
+	return netName, nil
+}