feat(status): раздел «Статус» — контейнеры, карточка, проверки (#14)

- docker-socket-proxy в Compose (только GET /containers/*), сокет только у него
- app/runtime/docker.py: read-only клиент; видны только контейнеры с меткой
  tgit.managed=true, чужие id отклоняются до запроса
- app/runtime/checks.py: running, health, рестарты за окно, CPU/RAM, ошибки
  в логе, HTTP-проба; у каждой проверки свой таймаут, отчёт всегда полный
- app/runtime/snapshots.py: снапшоты раз в 15 с в container_snapshots
- бот: список с 🟢🟡🔴⚪, карточка, «🩺 Запустить проверки», «🔄 Обновить»
- деплой ставит метки tgit.sha / tgit.deployed_at на контейнер бота
- имя джоба CD без неотрисованного выражения

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/runtime/test_docker.py

@@ -0,0 +1,110 @@
+import pytest
+
+from app.runtime.docker import DockerError, Light, demux_logs, light, parse_stats, parse_time
+from tests.runtime.fake_docker import FakeDocker, MiB, frame, now_minus
+
+
+@pytest.fixture
+def fake() -> FakeDocker:
+    fake = FakeDocker()
+    fake.add(
+        "tgit-dev-bot-1", service="bot", labels={"tgit.sha": "526eb56aa", "tgit.deployed_at": "2026-10-17T07:52:00Z"}
+    )
+    fake.add("tgit-dev-postgres-1", service="postgres")
+    fake.add("vobot-api-1", managed=False)  # someone else's project on the same host
+    return fake
+
+
+async def test_lists_only_managed_containers(fake: FakeDocker) -> None:
+    async with fake.client() as docker:
+        names = [c.name for c in await docker.containers()]
+
+    assert names == ["tgit-dev-bot-1", "tgit-dev-postgres-1"]
+    assert all(r.method == "GET" for r in fake.requests)
+
+
+async def test_foreign_container_is_refused_without_a_request(fake: FakeDocker) -> None:
+    foreign = next(c for c in fake.containers.values() if not c.managed)
+    async with fake.client() as docker:
+        await docker.containers()
+        fake.requests.clear()
+        with pytest.raises(DockerError):
+            await docker.inspect(foreign.id)
+        with pytest.raises(DockerError):
+            await docker.logs(foreign.id)
+        with pytest.raises(DockerError):
+            await docker.resolve(foreign.id[:12])
+
+    assert all("/containers/json" in str(r.url) for r in fake.requests)  # only re-listings, never the foreign id
+
+
+async def test_inspect_and_stats(fake: FakeDocker) -> None:
+    async with fake.client() as docker:
+        bot = next(c for c in await docker.containers() if c.service == "bot")
+        details = await docker.inspect(await docker.resolve(bot.short_id))
+        stats = await docker.stats(bot.id)
+
+    assert details.light is Light.GREEN
+    assert details.sha == "526eb56aa"
+    assert details.deployed_at is not None and details.deployed_at.hour == 7
+    assert details.started_at is not None and details.started_at.microsecond == 123456  # nanoseconds trimmed
+    assert stats.cpu_pct == 5.0
+    assert stats.mem_bytes == 64 * MiB  # page cache subtracted
+    assert stats.mem_pct == 25.0
+
+
+async def test_logs_are_demultiplexed_and_since_filtered(fake: FakeDocker) -> None:
+    bot = next(c for c in fake.containers.values() if c.service == "bot")
+    bot.logs = [(now_minus(10), "old line"), (now_minus(1), "fresh line"), (now_minus(0.5), "ERR on stderr")]
+    async with fake.client() as docker:
+        await docker.containers()
+        text = await docker.logs(bot.id, since=now_minus(5))
+
+    assert text == "fresh line\nERR on stderr\n"
+
+
+async def test_unreachable_docker_is_a_docker_error(fake: FakeDocker) -> None:
+    fake.down = True
+    async with fake.client() as docker:
+        assert not await docker.ping()
+        with pytest.raises(DockerError, match="unreachable"):
+            await docker.containers()
+
+
+async def test_ping(fake: FakeDocker) -> None:
+    async with fake.client() as docker:
+        assert await docker.ping()
+
+
+def test_demux_plain_tty_stream_passes_through() -> None:
+    assert demux_logs(b"plain text\n") == "plain text\n"
+    assert demux_logs(frame("a\n") + frame("b\n", 2)) == "a\nb\n"
+
+
+@pytest.mark.parametrize(
+    ("state", "health", "code", "expected"),
+    [
+        ("running", "healthy", 0, Light.GREEN),
+        ("running", None, 0, Light.GREEN),
+        ("running", "starting", 0, Light.YELLOW),
+        ("running", "unhealthy", 0, Light.RED),
+        ("restarting", None, 0, Light.RED),
+        ("exited", None, 137, Light.RED),
+        ("exited", None, 0, Light.WHITE),
+        ("created", None, 0, Light.YELLOW),
+    ],
+)
+def test_light(state: str, health: str | None, code: int, expected: Light) -> None:
+    assert light(state, health, code) is expected
+
+
+def test_parse_time_edge_cases() -> None:
+    assert parse_time(None) is None
+    assert parse_time("0001-01-01T00:00:00Z") is None
+    assert parse_time("garbage") is None
+
+
+def test_parse_stats_without_previous_sample() -> None:
+    stats = parse_stats({"cpu_stats": {"cpu_usage": {"total_usage": 5}}, "memory_stats": {}})
+    assert stats.cpu_pct == 0.0
+    assert stats.mem_pct == 0.0