Add Markdown and ZIP notebook import

internal/api/import_notes.go

@@ -0,0 +1,44 @@
+package api
+
+import (
+	"errors"
+	"net/http"
+
+	"rawmark/internal/vault"
+)
+
+func (s *Server) importNotes(w http.ResponseWriter, r *http.Request) {
+	// 总请求上限包含表单开销，文件总量另由 vault 校验。
+	r.Body = http.MaxBytesReader(w, r.Body, vault.MaxImportBytes+(1<<20))
+	if err := r.ParseMultipartForm(8 << 20); err != nil {
+		var limit *http.MaxBytesError
+		if errors.As(err, &limit) {
+			writeError(w, 413, "导入文件总量不能超过 100 MB")
+		} else {
+			writeError(w, 400, "无法读取导入表单")
+		}
+		return
+	}
+	defer r.MultipartForm.RemoveAll()
+	headers := r.MultipartForm.File["files"]
+	if len(headers) == 0 || len(headers) > 10_000 {
+		writeError(w, 400, "请选择 Markdown 文件或一个 ZIP")
+		return
+	}
+	files := make([]vault.ImportFile, 0, len(headers))
+	for _, h := range headers {
+		f, err := h.Open()
+		if err != nil {
+			internalError(w, r, err)
+			return
+		}
+		defer f.Close()
+		files = append(files, vault.ImportFile{Name: h.Filename, Reader: f, Size: h.Size})
+	}
+	result, err := s.vault.Import(r.Context(), r.FormValue("dir"), r.FormValue("folder"), files)
+	if err != nil {
+		vaultError(w, r, err)
+		return
+	}
+	writeJSON(w, http.StatusCreated, result)
+}