feat: simplify data and add cache to LocalFsAdapter

server/internal/adapters/interface.go

@@ -3,33 +3,26 @@ package adapters
 
 import "time"
 
+// Entry represents a file or directory in the filesystem.
+type Entry struct {
+	Type    string    `json:"type"`              // "file" | "dir"
+	Name    string    `json:"name"`              // base name
+	Path    string    `json:"path"`              // full path or virtual path
+	ModTime time.Time `json:"modTime"`           // last modified
+
+	// File-only (optional)
+	MIME string `json:"mime,omitempty"` // e.g. "text/markdown"
+	Size int64  `json:"size,omitempty"` // bytes
+
+	// Content:
+	// - markdown file: any (parsed AST / arbitrary JSON)
+	// - directory: []*Entry (children)
+	// - other files: omitted
+	Content any `json:"content,omitempty"`
+}
+
+// FileAdapter is the interface for accessing the file system.
 type FileAdapter interface {
-	Read(path string) (FsResponse, error)
+	Read(path string) (*Entry, error)
 	Write(path string, content []byte) error
-}
-
-type FsFile struct {
-	Name    string    `json:"name"`
-	Type    string    `json:"type"`
-	Content []byte    `json:"content"`
-	ModTime time.Time `json:"modTime"`
-}
-
-type FsDirEntry struct {
-	Name    string    `json:"name"`
-	Type    string    `json:"type"`
-	IsDir   bool      `json:"isDir,omitempty"`
-	ModTime time.Time `json:"modTime"`
-	Content any       `json:"content,omitempty"`
-}
-
-type FsDir struct {
-	Files   []FsDirEntry `json:"files"`
-	Name    string       `json:"name"`
-	ModTime time.Time    `json:"modTime"`
-}
-
-type FsResponse struct {
-	Dir  *FsDir  `json:"dir,omitempty"`
-	File *FsFile `json:"file,omitempty"`
-}
+}