feat(taskflow): add core task API, storage persistence, csv export, stats page, and test coverage

tests/test_health.py

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+from datetime import datetime
+
+import pytest
+from fastapi.testclient import TestClient
+
+from app.main import app
+
+
+client = TestClient(app)
+
+
+def test_health_ok():
+    response = client.get("/health")
+
+    assert response.status_code == 200
+
+    data = response.json()
+    assert data["status"] == "ok"
+    assert "server_time" in data
+
+    # Validate ISO-8601 format (basic check via fromisoformat)
+    parsed = datetime.fromisoformat(data["server_time"])
+    assert isinstance(parsed, datetime)
+
+
+def test_health_idempotent_time_increases():
+    response1 = client.get("/health")
+    response2 = client.get("/health")
+
+    assert response1.status_code == 200
+    assert response2.status_code == 200
+
+    data1 = response1.json()
+    data2 = response2.json()
+
+    t1 = datetime.fromisoformat(data1["server_time"])
+    t2 = datetime.fromisoformat(data2["server_time"])
+
+    assert t2 >= t1
+
+
+def test_health_method_not_allowed():
+    response = client.post("/health")
+
+    assert response.status_code == 405