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/environment_variables/__init__.py

@@ -0,0 +1,88 @@
+# 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.
+
+OTEL_LOGS_EXPORTER = "OTEL_LOGS_EXPORTER"
+"""
+.. envvar:: OTEL_LOGS_EXPORTER
+
+"""
+
+OTEL_METRICS_EXPORTER = "OTEL_METRICS_EXPORTER"
+"""
+.. envvar:: OTEL_METRICS_EXPORTER
+
+Specifies which exporter is used for metrics. See `General SDK Configuration
+<https://opentelemetry.io/docs/concepts/sdk-configuration/general-sdk-configuration/#otel_metrics_exporter>`_.
+
+**Default value:** ``"otlp"``
+
+**Example:**
+
+``export OTEL_METRICS_EXPORTER="prometheus"``
+
+Accepted values for ``OTEL_METRICS_EXPORTER`` are:
+
+- ``"otlp"``
+- ``"prometheus"``
+- ``"none"``: No automatically configured exporter for metrics.
+
+.. note::
+
+    Exporter packages may add entry points for group ``opentelemetry_metrics_exporter`` which
+    can then be used with this environment variable by name. The entry point should point to
+    either a `opentelemetry.sdk.metrics.export.MetricExporter` (push exporter) or
+    `opentelemetry.sdk.metrics.export.MetricReader` (pull exporter) subclass; it must be
+    constructable without any required arguments. This mechanism is considered experimental and
+    may change in subsequent releases.
+"""
+
+OTEL_PROPAGATORS = "OTEL_PROPAGATORS"
+"""
+.. envvar:: OTEL_PROPAGATORS
+"""
+
+OTEL_PYTHON_CONTEXT = "OTEL_PYTHON_CONTEXT"
+"""
+.. envvar:: OTEL_PYTHON_CONTEXT
+"""
+
+OTEL_PYTHON_ID_GENERATOR = "OTEL_PYTHON_ID_GENERATOR"
+"""
+.. envvar:: OTEL_PYTHON_ID_GENERATOR
+"""
+
+OTEL_TRACES_EXPORTER = "OTEL_TRACES_EXPORTER"
+"""
+.. envvar:: OTEL_TRACES_EXPORTER
+"""
+
+OTEL_PYTHON_TRACER_PROVIDER = "OTEL_PYTHON_TRACER_PROVIDER"
+"""
+.. envvar:: OTEL_PYTHON_TRACER_PROVIDER
+"""
+
+OTEL_PYTHON_METER_PROVIDER = "OTEL_PYTHON_METER_PROVIDER"
+"""
+.. envvar:: OTEL_PYTHON_METER_PROVIDER
+"""
+
+_OTEL_PYTHON_LOGGER_PROVIDER = "OTEL_PYTHON_LOGGER_PROVIDER"
+"""
+.. envvar:: OTEL_PYTHON_LOGGER_PROVIDER
+"""
+
+_OTEL_PYTHON_EVENT_LOGGER_PROVIDER = "OTEL_PYTHON_EVENT_LOGGER_PROVIDER"
+"""
+.. envvar:: OTEL_PYTHON_EVENT_LOGGER_PROVIDER
+"""