✨ 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/db/database.go

@@ -0,0 +1,44 @@
+package db
+
+import (
+	"fmt"
+	"GoNavi-Wails/internal/connection"
+)
+
+type Database interface {
+	Connect(config connection.ConnectionConfig) error
+	Close() error
+	Ping() error
+	Query(query string) ([]map[string]interface{}, []string, error)
+	Exec(query string) (int64, error)
+	GetDatabases() ([]string, error)
+	GetTables(dbName string) ([]string, error)
+	GetCreateStatement(dbName, tableName string) (string, error)
+	GetColumns(dbName, tableName string) ([]connection.ColumnDefinition, error)
+	GetAllColumns(dbName string) ([]connection.ColumnDefinitionWithTable, error)
+	GetIndexes(dbName, tableName string) ([]connection.IndexDefinition, error)
+	GetForeignKeys(dbName, tableName string) ([]connection.ForeignKeyDefinition, error)
+	GetTriggers(dbName, tableName string) ([]connection.TriggerDefinition, error)
+}
+
+type BatchApplier interface {
+	ApplyChanges(tableName string, changes connection.ChangeSet) error
+}
+
+// Factory
+func NewDatabase(dbType string) (Database, error) {
+	switch dbType {
+	case "mysql":
+		return &MySQLDB{}, nil
+	case "postgres":
+		return &PostgresDB{}, nil
+	case "sqlite":
+		return &SQLiteDB{}, nil
+	default:
+		// Default to MySQL for backward compatibility if empty
+		if dbType == "" {
+			return &MySQLDB{}, nil
+		}
+		return nil, fmt.Errorf("unsupported database type: %s", dbType)
+	}
+}