feat: 添加图片生成功能及相关配置

- 添加图片生成相关配置和环境变量
- 新增图片上传服务和模型定义
- 扩展模型服务以支持图片生成模型
- 添加图片生成响应处理器
- 更新README文档以反映新功能
- 添加GitHub Actions发布工作流

app/core/uploader.py

@@ -0,0 +1,163 @@
+import requests
+from app.schemas.image_models import ImageMetadata, ImageUploader, UploadResponse
+from enum import Enum
+from typing import Optional, Any
+
+class UploadErrorType(Enum):
+    """上传错误类型枚举"""
+    NETWORK_ERROR = "network_error"  # 网络请求错误
+    AUTH_ERROR = "auth_error"        # 认证错误
+    INVALID_FILE = "invalid_file"    # 无效文件
+    SERVER_ERROR = "server_error"    # 服务器错误
+    PARSE_ERROR = "parse_error"      # 响应解析错误
+    UNKNOWN = "unknown"              # 未知错误
+
+
+class UploadError(Exception):
+    """图片上传错误异常类"""
+    
+    def __init__(
+        self,
+        message: str,
+        error_type: UploadErrorType = UploadErrorType.UNKNOWN,
+        status_code: Optional[int] = None,
+        details: Optional[dict] = None,
+        original_error: Optional[Exception] = None
+    ):
+        """
+        初始化上传错误异常
+        
+        Args:
+            message: 错误消息
+            error_type: 错误类型
+            status_code: HTTP状态码
+            details: 详细错误信息
+            original_error: 原始异常
+        """
+        self.message = message
+        self.error_type = error_type
+        self.status_code = status_code
+        self.details = details or {}
+        self.original_error = original_error
+        
+        # 构建完整错误信息
+        full_message = f"[{error_type.value}] {message}"
+        if status_code:
+            full_message = f"{full_message} (Status: {status_code})"
+        if details:
+            full_message = f"{full_message} - Details: {details}"
+            
+        super().__init__(full_message)
+    
+    @classmethod
+    def from_response(cls, response: Any, message: Optional[str] = None) -> "UploadError":
+        """
+        从HTTP响应创建错误实例
+        
+        Args:
+            response: HTTP响应对象
+            message: 自定义错误消息
+        """
+        try:
+            error_data = response.json()
+            details = error_data.get("data", {})
+            return cls(
+                message=message or error_data.get("message", "Unknown error"),
+                error_type=UploadErrorType.SERVER_ERROR,
+                status_code=response.status_code,
+                details=details
+            )
+        except Exception:
+            return cls(
+                message=message or "Failed to parse error response",
+                error_type=UploadErrorType.PARSE_ERROR,
+                status_code=response.status_code
+            )
+
+
+class SmMsUploader(ImageUploader):
+    API_URL = "https://sm.ms/api/v2/upload"
+    
+    def __init__(self, api_key: str):
+        self.api_key = api_key
+        
+    def upload(self, file: bytes, filename: str) -> UploadResponse:
+        try:
+            # 准备请求头
+            headers = {
+                "Authorization": f"Basic {self.api_key}"
+            }
+            
+            # 准备文件数据
+            files = {
+                "smfile": (filename, file, "image/png")
+            }
+            
+            # 发送请求
+            response = requests.post(
+                self.API_URL,
+                headers=headers,
+                files=files
+            )
+            
+            # 检查响应状态
+            response.raise_for_status()
+            
+            # 解析响应
+            result = response.json()
+            
+            # 验证上传是否成功
+            if not result.get("success"):
+                raise UploadError(result.get("message", "Upload failed"))
+                
+            # 转换为统一格式
+            data = result["data"]
+            image_metadata = ImageMetadata(
+                width=data["width"],
+                height=data["height"],
+                filename=data["filename"],
+                size=data["size"],
+                url=data["url"],
+                delete_url=data["delete"]
+            )
+            
+            return UploadResponse(
+                success=True,
+                code="success",
+                message="Upload success",
+                data=image_metadata
+            )
+            
+        except requests.RequestException as e:
+            # 处理网络请求相关错误
+            raise UploadError(f"Upload request failed: {str(e)}")
+        except (KeyError, ValueError) as e:
+            # 处理响应解析错误
+            raise UploadError(f"Invalid response format: {str(e)}")
+        except Exception as e:
+            # 处理其他未预期的错误
+            raise UploadError(f"Upload failed: {str(e)}")
+    
+    
+class QiniuUploader(ImageUploader):
+    def __init__(self, access_key: str, secret_key: str):
+        self.access_key = access_key
+        self.secret_key = secret_key
+        
+    def upload(self, file: bytes, filename: str) -> UploadResponse:
+        # 实现七牛云的具体上传逻辑
+        pass
+    
+    
+class ImageUploaderFactory:
+    @staticmethod
+    def create(provider: str, **credentials) -> ImageUploader:
+        if provider == "smms":
+            return SmMsUploader(credentials["api_key"])
+        elif provider == "qiniu":
+            return QiniuUploader(
+                credentials["access_key"], 
+                credentials["secret_key"]
+            )
+        raise ValueError(f"Unknown provider: {provider}")
+