feat(upload): integrate upload service for chat image validation and S3 uploads

- Added UploadService to handle image uploads and validation for chat messages.
- Updated ChatService and MessageService to utilize UploadService for validating image segments in messages.
- Enhanced wire generation to inject UploadService into relevant services.
- Introduced UploadImageBytes method in UploadService for uploading images directly from memory.
- Added TrustedPublicURLPrefix method in S3 Client for generating public URLs for uploaded images.

internal/service/upload_service.go

@@ -75,6 +75,41 @@ func (s *UploadService) UploadImage(ctx context.Context, file *multipart.FileHea
 	return url, previewURL, previewURLLarge, nil
 }
 
+const maxUploadImageBytesFromBuffer = 15 << 20 // 与聊天内联解码上限一致，略大于 upload.max_file_size 时可接受
+
+// UploadImageBytes 从内存字节上传图片（与 multipart 上传走同一套压缩与存储逻辑）。
+func (s *UploadService) UploadImageBytes(ctx context.Context, raw []byte, filename string) (url, previewURL, previewURLLarge string, err error) {
+	if len(raw) == 0 {
+		return "", "", "", fmt.Errorf("empty image data")
+	}
+	if len(raw) > maxUploadImageBytesFromBuffer {
+		return "", "", "", fmt.Errorf("image data too large")
+	}
+
+	detectedType := normalizeImageContentType(http.DetectContentType(raw))
+	compressedData, compressedType, cerr := compressImageData(raw, detectedType)
+	if cerr != nil {
+		compressedData = raw
+		compressedType = detectedType
+	}
+	compressedType = cmp.Or(compressedType, http.DetectContentType(compressedData))
+	ext := cmp.Or(getExtFromContentType(compressedType), strings.ToLower(filepath.Ext(filename)), ".jpg")
+
+	hash := sha256.Sum256(compressedData)
+	hashStr := fmt.Sprintf("%x", hash)
+	objectName := fmt.Sprintf("images/%s%s", hashStr, ext)
+	url, err = s.s3Client.UploadData(ctx, objectName, compressedData, compressedType)
+	if err != nil {
+		return "", "", "", fmt.Errorf("failed to upload to S3: %w", err)
+	}
+
+	previewURL, previewURLLarge, prevErr := s.GeneratePreviewImages(ctx, compressedData, hashStr)
+	if prevErr != nil {
+		zap.L().Warn("UploadImageBytes: preview generation failed", zap.Error(prevErr))
+	}
+	return url, previewURL, previewURLLarge, nil
+}
+
 // getExtFromContentType 根据Content-Type获取文件扩展名
 func getExtFromContentType(contentType string) string {
 	baseType, _, err := mime.ParseMediaType(contentType)