chore: 添加虚拟环境到仓库

- 添加 backend_service/venv 虚拟环境
- 包含所有Python依赖包
- 注意：虚拟环境约393MB，包含12655个文件

backend_service/venv/lib/python3.13/site-packages/opentelemetry/trace/status.py

@@ -0,0 +1,82 @@
+# Copyright The OpenTelemetry Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import enum
+import logging
+import typing
+
+logger = logging.getLogger(__name__)
+
+
+class StatusCode(enum.Enum):
+    """Represents the canonical set of status codes of a finished Span."""
+
+    UNSET = 0
+    """The default status."""
+
+    OK = 1
+    """The operation has been validated by an Application developer or Operator to have completed successfully."""
+
+    ERROR = 2
+    """The operation contains an error."""
+
+
+class Status:
+    """Represents the status of a finished Span.
+
+    Args:
+        status_code: The canonical status code that describes the result
+            status of the operation.
+        description: An optional description of the status.
+    """
+
+    def __init__(
+        self,
+        status_code: StatusCode = StatusCode.UNSET,
+        description: typing.Optional[str] = None,
+    ):
+        self._status_code = status_code
+        self._description = None
+
+        if description:
+            if not isinstance(description, str):
+                logger.warning("Invalid status description type, expected str")
+                return
+            if status_code is not StatusCode.ERROR:
+                logger.warning(
+                    "description should only be set when status_code is set to StatusCode.ERROR"
+                )
+                return
+
+        self._description = description
+
+    @property
+    def status_code(self) -> StatusCode:
+        """Represents the canonical status code of a finished Span."""
+        return self._status_code
+
+    @property
+    def description(self) -> typing.Optional[str]:
+        """Status description"""
+        return self._description
+
+    @property
+    def is_ok(self) -> bool:
+        """Returns false if this represents an error, true otherwise."""
+        return self.is_unset or self._status_code is StatusCode.OK
+
+    @property
+    def is_unset(self) -> bool:
+        """Returns true if unset, false otherwise."""
+        return self._status_code is StatusCode.UNSET