修复: OSS收藏打开+连接指示器根目录+字段映射+侧边栏重构+文件监听+首屏优化

internal/filesystem/service.go

@@ -268,6 +268,11 @@ func (s *FileSystemService) DeletePathWithContext(ctx context.Context, path stri
 
 // ListDir 列出目录内容
 func (s *FileSystemService) ListDir(path string) ([]map[string]interface{}, error) {
+	// 根路径：返回 Windows 盘符列表
+	if path == "/" || path == "\\" {
+		return s.listDrives()
+	}
+
 	// 路径验证
 	if err := s.validatePath(path); err != nil {
 		return nil, err
@@ -308,6 +313,25 @@ func (s *FileSystemService) ListDir(path string) ([]map[string]interface{}, erro
 	return result, nil
 }
 
+// listDrives 列出 Windows 可用盘符
+func (s *FileSystemService) listDrives() ([]map[string]interface{}, error) {
+	result := make([]map[string]interface{}, 0)
+	for _, drive := range "ABCDEFGHIJKLMNOPQRSTUVWXYZ" {
+		path := string(drive) + ":/"
+		_, err := os.Stat(path)
+		if err != nil {
+			continue
+		}
+		result = append(result, map[string]interface{}{
+			"name":   string(drive) + ":",
+			"path":   path,
+			"is_dir": true,
+			"size":   int64(0),
+		})
+	}
+	return result, nil
+}
+
 // CreateDir 创建目录，返回创建的目录信息
 func (s *FileSystemService) CreateDir(path string) (*FileOperationResult, error) {
 	if err := s.validatePath(path); err != nil {

internal/filewatch/watcher.go

@@ -0,0 +1,138 @@
+package filewatch
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/fsnotify/fsnotify"
+)
+
+type Watcher struct {
+	watcher   *fsnotify.Watcher
+	emitEvent func(name string, data ...any)
+	mu        sync.Mutex
+	watched   string // 当前监听的文件绝对路径
+}
+
+func NewWatcher(emitEvent func(name string, data ...any)) *Watcher {
+	return &Watcher{emitEvent: emitEvent}
+}
+
+// WatchFile 开始监听指定文件的变化。切换文件时自动取消旧监听。
+func (w *Watcher) WatchFile(path string) error {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+
+	absPath, err := filepath.Abs(path)
+	if err != nil {
+		return fmt.Errorf("解析路径失败: %w", err)
+	}
+
+	// 同一文件不重复监听
+	if absPath == w.watched {
+		return nil
+	}
+
+	// 停止旧监听
+	w.stopLocked()
+
+	// 检查文件是否存在
+	if _, err := os.Stat(absPath); err != nil {
+		return fmt.Errorf("文件不存在: %s", absPath)
+	}
+
+	// 创建 fsnotify watcher
+	fw, err := fsnotify.NewWatcher()
+	if err != nil {
+		return fmt.Errorf("创建文件监听器失败: %w", err)
+	}
+	w.watcher = fw
+
+	// fsnotify 在某些系统上不支持直接监听文件，监听其所在目录
+	dir := filepath.Dir(absPath)
+	if err := fw.Add(dir); err != nil {
+		fw.Close()
+		return fmt.Errorf("监听目录失败: %w", err)
+	}
+
+	w.watched = absPath
+
+	// 后台消费事件
+	go w.consumeEvents()
+
+	return nil
+}
+
+// UnwatchFile 停止监听
+func (w *Watcher) UnwatchFile() {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+	w.stopLocked()
+}
+
+func (w *Watcher) stopLocked() {
+	if w.watcher != nil {
+		w.watcher.Close()
+		w.watcher = nil
+	}
+	w.watched = ""
+}
+
+func (w *Watcher) consumeEvents() {
+	debounceDelay := 300 * time.Millisecond
+	var debounceTimer *time.Timer
+
+	for {
+		select {
+		case event, ok := <-w.watcher.Events:
+			if !ok {
+				return
+			}
+			// 只处理目标文件的 Write/Create/Rename 事件
+			if event.Op&(fsnotify.Write|fsnotify.Create|fsnotify.Rename) == 0 {
+				continue
+			}
+
+			w.mu.Lock()
+			target := w.watched
+			w.mu.Unlock()
+
+			if target == "" {
+				return // 已停止监听
+			}
+
+			// 路径比较（忽略大小写，Windows）
+			if !strings.EqualFold(event.Name, target) {
+				continue
+			}
+
+			// 防抖
+			if debounceTimer != nil {
+				debounceTimer.Stop()
+			}
+			debounceTimer = time.AfterFunc(debounceDelay, func() {
+				// 文件已不存在则跳过（如被删除）
+				if _, err := os.Stat(target); err != nil {
+					return
+				}
+				if w.emitEvent != nil {
+					w.emitEvent("file-changed", target)
+				}
+			})
+
+		case _, ok := <-w.watcher.Errors:
+			if !ok {
+				return
+			}
+		}
+	}
+}
+
+// Close 释放资源
+func (w *Watcher) Close() {
+	w.UnwatchFile()
+}