fix(litellm): handle FallbackStreamWrapper in router streaming responses [backport 4.3]

.riot/requirements/109a45b.txt

@@ -0,0 +1,75 @@
+#
+# This file is autogenerated by pip-compile with Python 3.13
+# by the following command:
+#
+#    pip-compile --allow-unsafe --no-annotate .riot/requirements/109a45b.in
+#
+aiohappyeyeballs==2.6.1
+aiohttp==3.13.3
+aiosignal==1.4.0
+annotated-types==0.7.0
+anyio==4.12.1
+attrs==25.4.0
+boto3==1.42.30
+botocore==1.42.30
+certifi==2026.1.4
+charset-normalizer==3.4.4
+click==8.3.1
+coverage[toml]==7.13.1
+distro==1.9.0
+filelock==3.20.3
+frozenlist==1.8.0
+fsspec==2026.1.0
+h11==0.16.0
+hf-xet==1.2.0
+httpcore==1.0.9
+httpx==0.28.1
+huggingface-hub==1.3.2
+hypothesis==6.45.0
+idna==3.11
+importlib-metadata==8.7.1
+iniconfig==2.3.0
+jinja2==3.1.6
+jiter==0.12.0
+jmespath==1.0.1
+jsonschema==4.26.0
+jsonschema-specifications==2025.9.1
+litellm==1.65.4
+markupsafe==3.0.3
+mock==5.2.0
+multidict==6.7.0
+openai==1.68.2
+opentracing==2.4.0
+packaging==25.0
+pluggy==1.6.0
+propcache==0.4.1
+pydantic==2.12.5
+pydantic-core==2.41.5
+pygments==2.19.2
+pytest==9.0.2
+pytest-asyncio==1.3.0
+pytest-cov==7.0.0
+pytest-mock==3.15.1
+python-dateutil==2.9.0.post0
+python-dotenv==1.2.1
+pyyaml==6.0.3
+referencing==0.37.0
+regex==2026.1.15
+requests==2.32.5
+rpds-py==0.30.0
+s3transfer==0.16.0
+shellingham==1.5.4
+six==1.17.0
+sniffio==1.3.1
+sortedcontainers==2.4.0
+tiktoken==0.12.0
+tokenizers==0.22.2
+tqdm==4.67.1
+typer-slim==0.21.1
+typing-extensions==4.15.0
+typing-inspection==0.4.2
+urllib3==2.6.3
+vcrpy==8.1.1
+wrapt==2.0.1
+yarl==1.22.0
+zipp==3.23.0

.riot/requirements/1229e9a.txt

@@ -0,0 +1,75 @@
+#
+# This file is autogenerated by pip-compile with Python 3.12
+# by the following command:
+#
+#    pip-compile --allow-unsafe --no-annotate .riot/requirements/1229e9a.in
+#
+aiohappyeyeballs==2.6.1
+aiohttp==3.13.3
+aiosignal==1.4.0
+annotated-types==0.7.0
+anyio==4.12.1
+attrs==25.4.0
+boto3==1.42.30
+botocore==1.42.30
+certifi==2026.1.4
+charset-normalizer==3.4.4
+click==8.3.1
+coverage[toml]==7.13.1
+distro==1.9.0
+filelock==3.20.3
+frozenlist==1.8.0
+fsspec==2026.1.0
+h11==0.16.0
+hf-xet==1.2.0
+httpcore==1.0.9
+httpx==0.28.1
+huggingface-hub==1.3.2
+hypothesis==6.45.0
+idna==3.11
+importlib-metadata==8.7.1
+iniconfig==2.3.0
+jinja2==3.1.6
+jiter==0.12.0
+jmespath==1.0.1
+jsonschema==4.26.0
+jsonschema-specifications==2025.9.1
+litellm==1.65.4
+markupsafe==3.0.3
+mock==5.2.0
+multidict==6.7.0
+openai==1.68.2
+opentracing==2.4.0
+packaging==25.0
+pluggy==1.6.0
+propcache==0.4.1
+pydantic==2.12.5
+pydantic-core==2.41.5
+pygments==2.19.2
+pytest==9.0.2
+pytest-asyncio==1.3.0
+pytest-cov==7.0.0
+pytest-mock==3.15.1
+python-dateutil==2.9.0.post0
+python-dotenv==1.2.1
+pyyaml==6.0.3
+referencing==0.37.0
+regex==2026.1.15
+requests==2.32.5
+rpds-py==0.30.0
+s3transfer==0.16.0
+shellingham==1.5.4
+six==1.17.0
+sniffio==1.3.1
+sortedcontainers==2.4.0
+tiktoken==0.12.0
+tokenizers==0.22.2
+tqdm==4.67.1
+typer-slim==0.21.1
+typing-extensions==4.15.0
+typing-inspection==0.4.2
+urllib3==2.6.3
+vcrpy==8.1.1
+wrapt==2.0.1
+yarl==1.22.0
+zipp==3.23.0