feature: архитектура v2 — api + очередь + worker, удержание окна браузера (#78)

- Сервис api (FastAPI, без Chrome): POST /v2/tasks, GET /v2/tasks/{id} (доступ по cookie
  сессии), DELETE /v2/sessions/current; /v1/solve — прежний контракт поверх очереди.
- Сервис worker (dramatiq + RabbitMQ): слоты браузера, окна сессий между задачами
  (browser_idle_timeout 0–120 мин, простой — TTL ключа в Redis), heartbeat.
- Маршрутизация задач сессии в персональную очередь воркера с открытым окном.
- Redis: задачи, результаты (RESULT_TTL_HOURS), окна, воркеры. Прокси и ключ 2captcha
  в Redis не сохраняются.
- Движок: AsyncStealthySession.run() — действия на текущей странице без навигации.
- Два образа (robotex-api, robotex-worker), compose с rabbitmq и redis,
  make up/down/logs/smoke, релиз собирает все образы.
- Тесты: api + worker в одном процессе (fakeredis), настоящий воркер dramatiq на
  StubBroker, браузерные тесты на новой схеме, smoke для запущенного стенда.
- Документация: README, API (v2), Deployment, Usage.

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

tests/smoke.py

@@ -0,0 +1,76 @@
+"""Проверка запущенного стенда (make up): api, очередь, воркер с Chrome, удержание окна.
+
+	make smoke                                   # http://localhost:8000
+	make smoke API_URL=https://app.robotex.sokolab.xyz
+"""
+import sys
+import time
+
+import httpx
+
+URL = "https://example.com"
+READ_TITLE = [{"type": "inner_html", "selector": "title"}]
+
+
+def check(cond: bool, what: str) -> None:
+	print(("  ok   " if cond else "  FAIL ") + what)
+	if not cond:
+		sys.exit(1)
+
+
+def wait_task(client: httpx.Client, task_id: str, timeout: float = 180) -> dict:
+	deadline = time.monotonic() + timeout
+	while time.monotonic() < deadline:
+		task = client.get(f"/v2/tasks/{task_id}").json()
+		if task["status"] not in ("queued", "running"):
+			return task
+		time.sleep(0.5)
+	raise TimeoutError(f"task {task_id} not finished in {timeout}s")
+
+
+def windows(client: httpx.Client) -> int:
+	return sum(w["windows"] for w in client.get("/health").json()["workers"])
+
+
+def main(base_url: str) -> None:
+	client = httpx.Client(base_url=base_url, timeout=300)
+
+	print("health")
+	health = client.get("/health").json()
+	check(len(health["workers"]) > 0, f"workers: {[w['worker_id'] for w in health['workers']]}, free slots {health['free_slots']}")
+
+	print("v1 /v1/solve")
+	started = time.monotonic()
+	data = client.post("/v1/solve", json={"url": URL, "actions": READ_TITLE}).json()
+	check(data["status"] == "ok", f"status {data['status']} {data.get('error', '')} ({time.monotonic() - started:.1f}s)")
+	check(data["actions"][0]["result"] == "Example Domain", "title = Example Domain")
+
+	print("v2 window held between tasks")
+	v2 = httpx.Client(base_url=base_url, timeout=60)  # своя сессия
+	started = time.monotonic()
+	created = v2.post("/v2/tasks", json={"url": URL, "actions": READ_TITLE, "browser_idle_timeout": 2})
+	check(created.status_code == 202, f"POST /v2/tasks -> {created.status_code}")
+	task = wait_task(v2, created.json()["task_id"])
+	check(task["status"] == "done" and task["result"]["status"] == "ok", f"first task done ({time.monotonic() - started:.1f}s)")
+	check(windows(client) >= 1, "window stays open")
+
+	started = time.monotonic()
+	created = v2.post("/v2/tasks", json={"actions": READ_TITLE, "browser_idle_timeout": 2})
+	task = wait_task(v2, created.json()["task_id"])
+	check(
+		task["status"] == "done" and task["result"]["actions"][0]["result"] == "Example Domain",
+		f"second task without url ran in the open window ({time.monotonic() - started:.1f}s)",
+	)
+
+	check(client.get(f"/v2/tasks/{created.json()['task_id']}").status_code == 404, "task hidden from other sessions")
+
+	check(v2.delete("/v2/sessions/current").json() == {"closed": True}, "DELETE /v2/sessions/current")
+	deadline = time.monotonic() + 15
+	while windows(client) and time.monotonic() < deadline:
+		time.sleep(0.5)
+	check(windows(client) == 0, "window closed, slot released")
+	print("all good")
+
+
+if __name__ == "__main__":
+	main(sys.argv[1] if len(sys.argv) > 1 else "http://localhost:8000")