Scaffold FastAPI backend skeleton with health probes

Phase 0 foundation. uv-managed FastAPI app (package=false, runs from source via uv run). Layered seams in place: app/api for routers, app/core for config (pydantic-settings, fully env-driven) and the async SQLAlchemy engine; service/repository/domain layers land with the data model.

Exposes /health (liveness) and /health/ready (Postgres reachability via SELECT 1, 503 on failure) so the deploy wiring is verifiable before any data model exists. Includes a liveness test and the resolved uv.lock. Ignore pytest/ruff/mypy caches.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Signed-off-by: Justin Paul <justin@jpaul.me>

backend/tests/test_health.py

@@ -0,0 +1,17 @@
+"""Liveness probe test. Readiness is covered by an integration test once a
+test database fixture exists (it requires a live Postgres)."""
+
+from fastapi.testclient import TestClient
+
+from app.main import app
+
+client = TestClient(app)
+
+
+def test_health_liveness():
+    resp = client.get("/health")
+    assert resp.status_code == 200
+    body = resp.json()
+    assert body["status"] == "ok"
+    assert body["service"] == "Provenance"
+    assert "version" in body