T10: Monitoring, Performance, Documentation & Environment Config — 38 tests, ruff clean, docs OK

- Extended health endpoint: DB+Redis+Storage+Worker checks with degraded status
- Prometheus metrics endpoint: admin-only, text/plain format
- Metrics: http_requests_total, db_pool_connections, arq_jobs_total
- Structured JSON logging (structlog): timestamp, level, method, path, status, duration_ms, tenant_id
- Performance: page_size max 100 enforced (422), streaming CSV export (StreamingResponse)
- Scripts: seed_perf_data.py, check_indexes.py
- Docs: admin-guide.md (Deploy, Backup, Restore, Env-Vars, Troubleshooting), api-overview.md
- README updated: prod setup, API section, env profiles, admin-guide link
- .env.example: added SECRET_KEY, STORAGE_PATH, SMTP_* vars
- 38 new tests, full regression 564/564 pass (0 failures)
- Ruff: all checks passed

tests/test_health.py

@@ -1,4 +1,4 @@
-"""Health endpoint test — AC 18."""
+"""Health endpoint test — AC1-2: Extended health check with DB, Redis, storage, worker."""
 
 from __future__ import annotations
 
@@ -8,12 +8,52 @@ from httpx import AsyncClient
 
 @pytest.mark.asyncio
 class TestHealth:
-    """AC 18: GET /api/v1/health -> 200 without auth."""
+    """AC1: GET /api/v1/health -> 200 without auth, with extended checks."""
 
     async def test_health_returns_200_without_auth(self, client: AsyncClient):
-        """AC 18: GET /api/v1/health -> 200 without auth."""
+        """AC1: GET /api/v1/health -> 200 without auth."""
         resp = await client.get("/api/v1/health")
         assert resp.status_code == 200
         data = resp.json()
-        assert data["status"] == "ok"
+        assert "status" in data
         assert "version" in data
+        assert "checks" in data
+
+    async def test_health_has_database_check(self, client: AsyncClient):
+        """AC1: Health response includes checks.database."""
+        resp = await client.get("/api/v1/health")
+        assert resp.status_code == 200
+        data = resp.json()
+        assert "database" in data["checks"]
+        assert "status" in data["checks"]["database"]
+
+    async def test_health_has_redis_check(self, client: AsyncClient):
+        """AC1: Health response includes checks.redis."""
+        resp = await client.get("/api/v1/health")
+        assert resp.status_code == 200
+        data = resp.json()
+        assert "redis" in data["checks"]
+        assert "status" in data["checks"]["redis"]
+
+    async def test_health_has_storage_check(self, client: AsyncClient):
+        """AC1: Health response includes checks.storage."""
+        resp = await client.get("/api/v1/health")
+        assert resp.status_code == 200
+        data = resp.json()
+        assert "storage" in data["checks"]
+        assert "status" in data["checks"]["storage"]
+
+    async def test_health_has_worker_check(self, client: AsyncClient):
+        """AC1: Health response includes checks.worker."""
+        resp = await client.get("/api/v1/health")
+        assert resp.status_code == 200
+        data = resp.json()
+        assert "worker" in data["checks"]
+        assert "status" in data["checks"]["worker"]
+
+    async def test_health_status_is_valid_value(self, client: AsyncClient):
+        """Health status should be 'healthy' or 'degraded'."""
+        resp = await client.get("/api/v1/health")
+        assert resp.status_code == 200
+        data = resp.json()
+        assert data["status"] in ("healthy", "degraded")