Add backend and frontend skeleton

app/backend/features/health/__init__.py

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+"""Health check feature."""

app/backend/features/health/router.py

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+"""Health endpoints."""
+
+from fastapi import APIRouter, Depends
+
+from core.config import Settings, get_settings
+from features.health.schemas import HealthResponse
+
+router = APIRouter(prefix="/health", tags=["health"])
+
+
+def build_health_payload(settings: Settings) -> HealthResponse:
+    """Build health response payload."""
+    return HealthResponse(
+        status="ok",
+        service=settings.service_name,
+        environment=settings.environment,
+    )
+
+
+@router.get("/", response_model=HealthResponse)
+def health(settings: Settings = Depends(get_settings)) -> HealthResponse:
+    """Return lightweight health status."""
+    return build_health_payload(settings)

app/backend/features/health/schemas.py

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+"""Pydantic schemas for health responses."""
+
+from pydantic import BaseModel, Field
+
+
+class HealthResponse(BaseModel):
+    status: str = Field(default="ok", description="Overall service status.")
+    service: str = Field(default="backend", description="Service name.")
+    environment: str = Field(default="development", description="Runtime environment.")