新增：Markdown编辑器/数据库优化/安全修复

- Markdown 编辑器：实时预览、PDF 导出、独立查看器
- 数据库优化：动态连接池、查询缓存、Redis Pipeline
- 窗口置顶功能
- 文件系统增强：右键菜单、编辑器集成、收藏夹重构
- 安全修复：XSS 防护、路径穿越、HTML 注入
- 代码质量：正则预编译、缓存锁优化、死代码清理

internal/api/connection_api.go

@@ -1,18 +1,18 @@
 package api
 
 import (
-	"u-desk/internal/storage"
+	"u-desk/internal/service"
 	"u-desk/internal/storage/models"
 )
 
 // ConnectionAPI 连接管理API
 type ConnectionAPI struct {
-	connService *storage.ConnectionService
+	connService *service.ConnectionService
 }
 
 // NewConnectionAPI 创建连接管理API
 func NewConnectionAPI() (*ConnectionAPI, error) {
-	connService, err := storage.NewConnectionService()
+	connService, err := service.NewConnectionService()
 	if err != nil {
 		return nil, err
 	}
@@ -82,11 +82,7 @@ func (api *ConnectionAPI) DeleteDbConnection(id uint) error {
 }
 
 func (api *ConnectionAPI) TestDbConnection(id uint) error {
-	conn, err := api.connService.GetConnection(id)
-	if err != nil {
-		return err
-	}
-	return api.connService.TestConnection(conn)
+	return api.connService.TestConnection(id)
 }
 
 // TestConnectionRequest 测试连接请求结构体（不保存数据）
@@ -104,14 +100,9 @@ type TestConnectionRequest struct {
 // TestDbConnectionWithParams 测试数据库连接（直接传入参数，不保存数据）
 func (api *ConnectionAPI) TestDbConnectionWithParams(req TestConnectionRequest) error {
 	return api.connService.TestConnectionWithParams(
-		req.Type,
-		req.Host,
-		req.Port,
-		req.Username,
-		req.Password,
-		req.Database,
-		req.Options,
-		req.ID,
+		req.Type, req.Host, req.Port,
+		req.Username, req.Password, req.Database,
+		req.Options, req.ID,
 	)
 }
 
@@ -130,13 +121,8 @@ type LoadAllDatabasesRequest struct {
 // LoadAllDatabases 加载全部数据库列表
 func (api *ConnectionAPI) LoadAllDatabases(req LoadAllDatabasesRequest) ([]string, error) {
 	return api.connService.LoadAllDatabases(
-		req.Type,
-		req.Host,
-		req.Port,
-		req.Username,
-		req.Password,
-		req.Database,
-		req.Options,
-		req.ID,
+		req.Type, req.Host, req.Port,
+		req.Username, req.Password, req.Database,
+		req.Options, req.ID,
 	)
 }