fix: types

semantic_router/llms/base.py

semantic_router/llms/llamacpp.py

semantic_router/llms/mistral.py

semantic_router/llms/ollama.py

semantic_router/llms/openai.py

semantic_router/llms/openrouter.py

semantic_router/llms/zure.py

tests/unit/encoders/test_fastembed.py

tests/unit/encoders/test_hfendpointencoder.py

tests/unit/encoders/test_huggingface.py

tests/unit/encoders/test_mistral.py

tests/unit/llms/test_llm_ollama.py