feat(api): add tencent cos storage for memoir images

Made-with: Cursor

api/services/memoir_images/storage.py

@@ -0,0 +1,30 @@
+import os
+
+from qcloud_cos import CosConfig, CosS3Client
+
+
+class TencentCosStorageService:
+    def __init__(self, secret_id: str, secret_key: str, region: str, bucket: str, base_url: str):
+        self.bucket = bucket
+        self.base_url = base_url.rstrip("/")
+        config = CosConfig(Region=region, SecretId=secret_id, SecretKey=secret_key)
+        self.client = CosS3Client(config)
+
+    def upload_bytes(self, image_bytes: bytes, key: str, content_type: str) -> str:
+        self.client.put_object(
+            Bucket=self.bucket,
+            Body=image_bytes,
+            Key=key,
+            ContentType=content_type,
+        )
+        return f"{self.base_url}/{key}"
+
+    @classmethod
+    def from_env(cls) -> "TencentCosStorageService":
+        return cls(
+            secret_id=os.getenv("TENCENT_COS_SECRET_ID", ""),
+            secret_key=os.getenv("TENCENT_COS_SECRET_KEY", ""),
+            region=os.getenv("TENCENT_COS_REGION", ""),
+            bucket=os.getenv("TENCENT_COS_BUCKET", ""),
+            base_url=os.getenv("TENCENT_COS_BASE_URL", ""),
+        )