test: юнит-тесты и сквозные тесты с Chrome (#21)

- tests/unit (make test, без браузера, ~5 с): схемы и валидация, /v1/solve с подменённым
  движком (коды ошибок, слоты, сессии, UA и cookies профиля, маскирование секретов в логах),
  действия, оркестратор антибота, профиль и отпечаток
- tests/browser (make test-browser, в Docker): example.com, UA один раз и замена cookies
  на httpbin, применение и стабильность отпечатка, прохождение Cloudflare
- requirements-dev.txt, make sync-dev; Makefile вызывает pip через python -m pip
  (у перенесённого .venv битый shebang bin/pip)
- fix: в CloudflareSolver вызов bounding_box() у неожиданной корутины — ветка без iframe
  всегда падала с AttributeError

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

tests/unit/test_schemas.py

@@ -0,0 +1,75 @@
+import pytest
+from pydantic import ValidationError
+
+from api.schemas import ActionRequest, SolveRequest, WAIT_FOR_DEFAULT_TIMEOUT
+
+
+def solve(**kwargs) -> SolveRequest:
+	return SolveRequest(**{"url": "https://example.com", "actions": [], **kwargs})
+
+
+@pytest.mark.parametrize("action, error", [
+	({"type": "nope"}, "unknown action type"),
+	({"type": "wait_for"}, "requires: selector"),
+	({"type": "fill", "selector": "#q"}, "requires: value"),
+	({"type": "fill", "selector": "#q", "value": ""}, "requires: value"),
+	({"type": "click"}, "requires: selector"),
+	({"type": "delay"}, "requires: value"),
+	({"type": "delay", "value": "abc"}, "integer"),
+	({"type": "delay", "value": "601"}, "between 0 and 600"),
+	({"type": "wait_for", "selector": "a", "timeout": 0}, "between 1 and 7200"),
+	({"type": "wait_for", "selector": "a", "timeout": 7201}, "between 1 and 7200"),
+	({"type": "captcha", "selector": "#c", "value": "datadome"}, "captcha value must be one of"),
+])
+def test_invalid_action(action, error):
+	with pytest.raises(ValidationError, match=error):
+		ActionRequest(**action)
+
+
+@pytest.mark.parametrize("action", [
+	{"type": "wait_for", "selector": "a", "timeout": 10},
+	{"type": "fill", "selector": "#q", "value": "x"},
+	{"type": "delay", "value": "0"},
+	{"type": "pass_challenge"},
+	{"type": "captcha", "selector": "#c", "value": "hcaptcha"},
+	{"type": "inner_html", "selector": "h1"},
+])
+def test_valid_action(action):
+	assert ActionRequest(**action).type == action["type"]
+
+
+def test_wait_for_default_timeout():
+	assert ActionRequest(type="wait_for", selector="a").timeout == WAIT_FOR_DEFAULT_TIMEOUT
+
+
+@pytest.mark.parametrize("proxy", [
+	"http://host:8080",
+	"https://user:pass@host:443",
+	"socks5://10.0.0.1:1080",
+])
+def test_valid_proxy(proxy):
+	assert solve(proxy=proxy).proxy == proxy
+
+
+@pytest.mark.parametrize("proxy, error", [
+	("host:8080", "scheme"),
+	("ftp://host:21", "scheme"),
+	("http://host", "host:port"),
+	("http://:8080", "host:port"),
+	("http://host:99999", "invalid proxy url"),
+])
+def test_invalid_proxy(proxy, error):
+	with pytest.raises(ValidationError, match=error):
+		solve(proxy=proxy)
+
+
+def test_proxy_optional():
+	assert solve().proxy is None
+	assert solve(proxy="").proxy is None
+
+
+def test_captcha_action_requires_key():
+	action = {"type": "captcha", "selector": "#c", "value": "recaptcha"}
+	with pytest.raises(ValidationError, match="requires request field 'captcha'"):
+		solve(actions=[action])
+	assert solve(actions=[action], captcha="key").captcha == "key"