feat(notification): 增加钉钉发送图片和文件功能，支持OSS图片上传

- 在DingTalkBot中添加发送图片消息（自动压缩）功能，支持大小限制自动处理
- 添加发送图文混合消息、发送文件消息接口，优化钉钉通知能力
- 实现发送本地图片链接和通过OSS上传图片再发送Markdown图文两种机制
- 新增阿里云OSS上传工具模块，支持文件和图片上传及预签名URL生成
- 创建每日任务调度脚本，实现每日交易日检查、策略执行、结果上传并通知
- 调整回测策略开始日期至2022年，适配最新数据范围

core/common/oss_utils.py

@@ -0,0 +1,172 @@
+"""
+阿里云 OSS 工具模块
+用于上传文件到 OSS 并生成访问链接
+"""
+
+import oss2
+import os
+from datetime import datetime
+from typing import Optional
+from loguru import logger
+
+
+class OSSUploader:
+    """OSS 文件上传器"""
+
+    def __init__(
+        self,
+        access_key_id: str = None,
+        access_key_secret: str = None,
+        bucket_name: str = None,
+        endpoint: str = None,
+    ):
+        """
+        初始化 OSS 上传器
+
+        Args:
+            access_key_id: 阿里云 AccessKey ID
+            access_key_secret: 阿里云 AccessKey Secret
+            bucket_name: OSS Bucket 名称
+            endpoint: OSS 区域 Endpoint
+        """
+        # 从环境变量或参数获取配置
+        self.access_key_id = access_key_id or os.getenv("OSS_ACCESS_KEY_ID")
+        self.access_key_secret = access_key_secret or os.getenv("OSS_ACCESS_KEY_SECRET")
+        self.bucket_name = bucket_name or os.getenv("OSS_BUCKET_NAME", "value-investing")
+        self.endpoint = endpoint or os.getenv("OSS_ENDPOINT", "https://oss-cn-wulanchabu.aliyuncs.com")
+
+        self.bucket = None
+        self._init_bucket()
+
+    def _init_bucket(self):
+        """初始化 OSS Bucket"""
+        if not all([self.access_key_id, self.access_key_secret, self.bucket_name, self.endpoint]):
+            logger.warning("OSS 配置不完整，无法初始化")
+            return
+
+        try:
+            auth = oss2.Auth(self.access_key_id, self.access_key_secret)
+            self.bucket = oss2.Bucket(auth, self.endpoint, self.bucket_name)
+            logger.info(f"OSS Bucket 初始化成功: {self.bucket_name}")
+        except Exception as e:
+            logger.error(f"OSS Bucket 初始化失败: {e}")
+            self.bucket = None
+
+    def upload_file(
+        self,
+        local_path: str,
+        oss_key: str = None,
+        expire_seconds: int = 3600 * 24 * 7,  # 默认7天有效期
+    ) -> Optional[str]:
+        """
+        上传文件到 OSS
+
+        Args:
+            local_path: 本地文件路径
+            oss_key: OSS 中的目标路径，如果不指定则自动生成
+            expire_seconds: 预签名URL有效期（秒）
+
+        Returns:
+            str: 可访问的 URL，失败返回 None
+        """
+        if not self.bucket:
+            logger.error("OSS Bucket 未初始化")
+            return None
+
+        if not os.path.exists(local_path):
+            logger.error(f"本地文件不存在: {local_path}")
+            return None
+
+        try:
+            # 自动生成 OSS 路径
+            if not oss_key:
+                file_name = os.path.basename(local_path)
+                date_str = datetime.now().strftime("%Y%m%d")
+                oss_key = f"etf-signals/{date_str}/{file_name}"
+
+            # 上传文件
+            self.bucket.put_object_from_file(oss_key, local_path)
+            logger.info(f"文件上传成功: {local_path} -> {oss_key}")
+
+            # 生成预签名 URL
+            url = self.bucket.sign_url("GET", oss_key, expire_seconds)
+            return url
+
+        except Exception as e:
+            logger.error(f"文件上传失败: {e}")
+            return None
+
+    def upload_image(
+        self,
+        image_path: str,
+        expire_days: int = 7,
+    ) -> Optional[str]:
+        """
+        上传图片到 OSS（专门用于钉钉通知）
+
+        Args:
+            image_path: 图片文件路径
+            expire_days: URL 有效期（天）
+
+        Returns:
+            str: 图片访问 URL
+        """
+        if not os.path.exists(image_path):
+            logger.error(f"图片文件不存在: {image_path}")
+            return None
+
+        # 生成带时间戳的 OSS 路径
+        file_name = os.path.basename(image_path)
+        timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
+        oss_key = f"etf-charts/{timestamp}_{file_name}"
+
+        return self.upload_file(image_path, oss_key, expire_days * 24 * 3600)
+
+    def delete_file(self, oss_key: str) -> bool:
+        """
+        删除 OSS 文件
+
+        Args:
+            oss_key: OSS 文件路径
+
+        Returns:
+            bool: 是否删除成功
+        """
+        if not self.bucket:
+            logger.error("OSS Bucket 未初始化")
+            return False
+
+        try:
+            self.bucket.delete_object(oss_key)
+            logger.info(f"文件删除成功: {oss_key}")
+            return True
+        except Exception as e:
+            logger.error(f"文件删除失败: {e}")
+            return False
+
+
+# 全局单例
+_oss_uploader: Optional[OSSUploader] = None
+
+
+def get_oss_uploader() -> OSSUploader:
+    """获取 OSS 上传器单例"""
+    global _oss_uploader
+    if _oss_uploader is None:
+        _oss_uploader = OSSUploader()
+    return _oss_uploader
+
+
+def upload_image_to_oss(image_path: str, expire_days: int = 7) -> Optional[str]:
+    """
+    便捷函数：上传图片到 OSS
+
+    Args:
+        image_path: 图片路径
+        expire_days: URL 有效期（天）
+
+    Returns:
+        str: 图片访问 URL
+    """
+    uploader = get_oss_uploader()
+    return uploader.upload_image(image_path, expire_days)