Add a test suite, a linter and a CI gate in front of the build (0.45.0)

The repo had no tests, no lint config, and a CI that went straight from push
to docker push. That is the reason F1 could ship: authorization lives in the
routers, each of 171 routes independently picks require_admin or
get_current_user, and nothing checked the choice was right.

670 tests, no Docker daemon needed. The app is driven through TestClient
without entering it as a context manager, which skips the lifespan — no
background loops, no socket — and conftest points DATA_DIR/STACKS_DIR at a
temp directory before anything is imported.

test_route_authorization.py is the load-bearing one. Rather than 171 implied
decisions it states the policy once — every route requires admin unless it is
listed in USER_READABLE or PUBLIC — and fails on any route that disagrees. A
new route defaults to admin, which is the safe direction; what it catches is a
route written with get_current_user that nobody weighed against "can this
return a credential". Writing the allowlist meant auditing all 53 user-readable
routes, which turned up one more leak: GET /api/templates/{id} returns a
template's env, and "save stack as template" snapshots the stack's real .env
into it. Now admin-only; the listing stays open.

test_agent_authorization.py pins the same invariant on the agent, where the
whole access model is one shared token declared per route and a single
forgotten Depends(verify_token) would hand over the host.

Both were checked by reintroducing the bug: re-opening /api/files/read fails
three tests with actionable messages, dropping a token guard fails two.

test_bundled_templates.py covers the 83 templates — parse, image per service,
.env.example in sync with what compose reads, every bind-mounted file actually
shipped, and no working default password. It found one on its first run:
authentik shipped PG_PASS=change-me and AUTHENTIK_SECRET_KEY=change-me against
a compose that marks both required, so the stack would have come up with a
known password instead of refusing to start. Fixed.

The rest ports the ad-hoc harnesses from 0.44.0 into permanent tests (crypto
round-trip incl. plaintext passthrough and key-loss handling, the browse
sandbox) and covers compose_service's slug/status/file handling and
secret_service's name validation.

ruff is configured as a floor, not a style bar: F, E9 and B only. Import
sorting is deliberately out — it is style, and enabling it would rewrite the
imports of nine files that have nothing else wrong. The 12 findings it did have
are fixed here (unused imports, an unused local, four raise-without-from that
were swallowing exception context).

CI now runs check (ruff, pytest, tsc) and only builds if it passes.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Dk43rmEeRfYi5wsLDbmfyG

backend/services/backup_destination_service.py

@@ -12,7 +12,6 @@ from __future__ import annotations
 import io
 import json
 import logging
-import os
 import posixpath
 import stat
 import tarfile

backend/services/device_service.py

@@ -4,7 +4,6 @@ from __future__ import annotations
 import glob
 import os
 from dataclasses import asdict, dataclass
-from typing import Optional
 
 from config import settings
 

backend/services/exec_service.py

@@ -14,7 +14,7 @@ import socket as _socket
 
 from starlette.websockets import WebSocketDisconnect
 
-from docker_client import DockerError, get_client, safe_call
+from docker_client import get_client, safe_call
 from services.container_service import _get_managed
 
 DEFAULT_SHELL = "/bin/sh"

backend/services/settings_service.py

@@ -4,7 +4,7 @@ from __future__ import annotations
 import json
 from typing import Any, Optional
 
-from sqlmodel import Session, select
+from sqlmodel import Session
 
 from config import settings as env_settings
 from database import engine

backend/services/update_service.py

@@ -14,7 +14,6 @@ from typing import Optional
 
 import httpx
 
-from config import settings
 from docker_client import DockerError, get_client, safe_call
 from models.setting import EVENT_UPDATE_AVAILABLE
 from services import notify_service, settings_service