fix: preserve meeting note file metadata

internal/httpapi/api.go

@@ -557,12 +557,25 @@ func (a *API) meetingNoteFiles(w http.ResponseWriter, r *http.Request, p *auth.P
 		return
 	}
 	var body struct {
-		FileID string `json:"file_id"`
+		FileID   string `json:"file_id"`
+		FileName string `json:"file_name"`
+		Name     string `json:"name"`
+		MIMEType string `json:"mime_type"`
+		MIME     string `json:"mime"`
+		FileSize *int64 `json:"file_size"`
+		Size     *int64 `json:"size"`
 	}
 	if !decodeBody(w, r, &body) {
 		return
 	}
-	file, err := st.CreateMeetingNoteFile(r.Context(), p.UserID, meetingID, "mnote_"+randomToken(12), strings.TrimSpace(body.FileID), idempotencyKey)
+	fileID := strings.TrimSpace(body.FileID)
+	if fileID == "" {
+		writeError(w, r, http.StatusBadRequest, 30000, reasonMalformedRequest, "malformed request", map[string]any{"field": "file_id"})
+		return
+	}
+	file, err := st.CreateMeetingNoteFile(r.Context(), p.UserID, meetingID, "mnote_"+randomToken(12), store.MeetingNoteFileInput{
+		FileID: fileID, FileName: firstNonEmpty(body.FileName, body.Name), MIMEType: firstNonEmpty(body.MIMEType, body.MIME), FileSize: firstNonNilInt64(body.FileSize, body.Size),
+	}, idempotencyKey)
 	if err != nil {
 		writeStoreError(w, r, err)
 		return
@@ -583,13 +596,26 @@ func (a *API) meetingNoteFileResource(w http.ResponseWriter, r *http.Request, p
 	switch r.Method {
 	case http.MethodPut:
 		var body struct {
-			FileID  string `json:"file_id"`
-			Version int    `json:"version"`
+			FileID   string `json:"file_id"`
+			FileName string `json:"file_name"`
+			Name     string `json:"name"`
+			MIMEType string `json:"mime_type"`
+			MIME     string `json:"mime"`
+			FileSize *int64 `json:"file_size"`
+			Size     *int64 `json:"size"`
+			Version  int    `json:"version"`
 		}
 		if !decodeBody(w, r, &body) {
 			return
 		}
-		file, err := st.ReplaceMeetingNoteFile(r.Context(), p.UserID, meetingID, noteFileID, strings.TrimSpace(body.FileID), idempotencyKey, body.Version)
+		fileID := strings.TrimSpace(body.FileID)
+		if fileID == "" {
+			writeError(w, r, http.StatusBadRequest, 30000, reasonMalformedRequest, "malformed request", map[string]any{"field": "file_id"})
+			return
+		}
+		file, err := st.ReplaceMeetingNoteFile(r.Context(), p.UserID, meetingID, noteFileID, store.MeetingNoteFileInput{
+			FileID: fileID, FileName: firstNonEmpty(body.FileName, body.Name), MIMEType: firstNonEmpty(body.MIMEType, body.MIME), FileSize: firstNonNilInt64(body.FileSize, body.Size),
+		}, idempotencyKey, body.Version)
 		if err != nil {
 			writeStoreError(w, r, err)
 			return

internal/httpapi/payload.go

@@ -2,6 +2,8 @@ package httpapi
 
 import (
 	"encoding/json"
+	"mime"
+	"path/filepath"
 	"strings"
 	"time"
 
@@ -315,13 +317,18 @@ func meetingNotesDetailPayload(meeting store.Meeting, files []store.MeetingNoteF
 }
 
 func meetingNoteFilePayload(file store.MeetingNoteFile, viewer int64) map[string]any {
+	extension := meetingNoteFileExtension(file.FileName, file.MIMEType)
 	return map[string]any{
 		"note_file_id":     file.NoteFileID,
 		"meeting_id":       file.MeetingID,
 		"file_id":          file.FileID,
+		"name":             file.FileName,
 		"file_name":        file.FileName,
+		"mime":             file.MIMEType,
 		"mime_type":        file.MIMEType,
+		"size":             file.FileSize,
 		"file_size":        file.FileSize,
+		"file_extension":   extension,
 		"file_etag":        file.FileETag,
 		"status":           file.Status,
 		"preview_status":   file.PreviewStatus,
@@ -341,6 +348,17 @@ func meetingNoteFilePayload(file store.MeetingNoteFile, viewer int64) map[string
 	}
 }
 
+func meetingNoteFileExtension(fileName, mimeType string) string {
+	if ext := strings.ToLower(strings.TrimPrefix(filepath.Ext(strings.TrimSpace(fileName)), ".")); ext != "" {
+		return ext
+	}
+	exts, _ := mime.ExtensionsByType(strings.TrimSpace(mimeType))
+	if len(exts) == 0 {
+		return ""
+	}
+	return strings.ToLower(strings.TrimPrefix(exts[0], "."))
+}
+
 func dailyReportPayloads(reports []store.DailyReport) []map[string]any {
 	items := make([]map[string]any, 0, len(reports))
 	for _, report := range reports {

internal/httpapi/payload_userid_test.go

@@ -91,6 +91,30 @@ func TestMeetingPayloadIncludesNamesAndDerivedEndedState(t *testing.T) {
 	}
 }
 
+func TestMeetingNoteFilePayloadKeepsOriginalNameAndExtension(t *testing.T) {
+	now := time.Date(2026, 9, 17, 12, 0, 0, 0, time.UTC)
+	payload := meetingNoteFilePayload(store.MeetingNoteFile{
+		NoteFileID: "mnote_1",
+		FileID:     "file_1",
+		FileName:   "会议纪要.pdf",
+		MIMEType:   "application/pdf",
+		FileSize:   2048,
+		UploaderID: 1,
+		Status:     "active",
+		CreatedAt:  now,
+		UpdatedAt:  now,
+	}, 1)
+	if payload["file_name"] != "会议纪要.pdf" || payload["name"] != "会议纪要.pdf" {
+		t.Fatalf("payload names = file_name:%v name:%v", payload["file_name"], payload["name"])
+	}
+	if payload["file_extension"] != "pdf" {
+		t.Fatalf("file_extension = %v, want pdf", payload["file_extension"])
+	}
+	if payload["mime"] != "application/pdf" || payload["size"] != int64(2048) {
+		t.Fatalf("payload aliases = mime:%v size:%v", payload["mime"], payload["size"])
+	}
+}
+
 func assertNoNumericUserIDs(t *testing.T, value any) {
 	t.Helper()
 	switch typed := value.(type) {

internal/httpapi/response.go

@@ -87,3 +87,12 @@ func firstNonEmpty(values ...string) string {
 	}
 	return ""
 }
+
+func firstNonNilInt64(values ...*int64) *int64 {
+	for _, value := range values {
+		if value != nil {
+			return value
+		}
+	}
+	return nil
+}