feat: 知识库小重构

src/chat/knowledge/utils/hash.py

@@ -0,0 +1,8 @@
+import hashlib
+
+
+def get_sha256(string: str) -> str:
+    """获取字符串的SHA256值"""
+    sha256 = hashlib.sha256()
+    sha256.update(string.encode("utf-8"))
+    return sha256.hexdigest()