feat: new file structure

src/assistant/lib/api/v1/handlers/__init__.py

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+from .health import basic_router
+
+__all__ = ["basic_router"]

src/assistant/lib/api/v1/handlers/health/__init__.py

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+from .liveness_probe import basic_router
+
+__all__ = [
+    "basic_router",
+]

src/assistant/lib/api/v1/handlers/health/liveness_probe.py

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+import fastapi
+
+import lib.api.v1.schemas as api_shemas
+
+basic_router = fastapi.APIRouter()
+
+
+@basic_router.get(
+    "/",
+    response_model=api_shemas.HealthResponse,
+    summary="Статус работоспособности",
+    description="Проверяет доступность сервиса FastAPI.",
+)
+async def health():
+    return api_shemas.HealthResponse(status="healthy")

src/assistant/lib/api/v1/schemas/__init__.py

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+from .base import HealthResponse
+
+__all__ = ["HealthResponse"]

src/assistant/lib/api/v1/schemas/base.py

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+import pydantic
+
+
+class HealthResponse(pydantic.BaseModel):
+    status: str = pydantic.Field(default=..., examples=["healthy"], description="Схема доступности сервиса")