feat: VK OAuth flow, catalog sync improvements, and expanded test suite

- Add VK OAuth implicit flow: /vk-auth redirect, /vk-callback JS page,
  /vk-callback/save endpoint with state validation
- Add VK_CLIENT_ID/VK_CLIENT_SECRET to config
- Add refresh_token/token_expires_at columns to vk_connections (migration 0006)
- Fix vk_catalog task: handle price/thumb_photo as string or dict (VK API v5.199)
- Fix connections/vk/test: use groups.getById instead of market.getAlbums
  (works with both user and group tokens)
- Add orphan deletion to mirror_to_vk: VK products not in Evotor are removed
- Handle ungrouped Evotor products: push to "Без категории" VK album
- Respect SyncConfig.is_enabled in mirror_to_vk
- Add product count column to catalog groups page
- Add group name column to catalog products page
- Expand test suite: 73 new tests covering connections routes, catalog routes,
  vk_sync task logic, and catalog task helpers (138 total, all passing)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/test_tasks_vk_sync.py

@@ -0,0 +1,169 @@
+"""Unit tests for vk_sync task logic (price calc, name sanitization, orphan deletion)."""
+from datetime import datetime
+from decimal import Decimal
+from unittest.mock import MagicMock, call, patch
+
+import pytest
+
+from web.tasks.vk_sync import (
+    _build_description,
+    _calc_price,
+    _delete_orphans,
+    _is_weight,
+    _name_for_vk,
+)
+
+
+# ── _is_weight ────────────────────────────────────────────────────────────────
+
+@pytest.mark.parametrize("measure,expected", [
+    ("г", True),
+    ("г.", True),
+    ("гр", True),
+    ("гр.", True),
+    ("грамм", True),
+    ("граммов", True),
+    ("  Г  ", True),   # case-insensitive, stripped
+    ("кг", False),
+    ("шт", False),
+    ("л", False),
+    (None, False),
+    ("", False),
+])
+def test_is_weight(measure, expected):
+    assert _is_weight(measure) == expected
+
+
+# ── _calc_price ───────────────────────────────────────────────────────────────
+
+def test_calc_price_normal(monkeypatch):
+    monkeypatch.setattr("web.tasks.vk_sync.settings.VK_WEIGHT_PRICE_MULTIPLIER", 10)
+    assert _calc_price(Decimal("150"), "шт") == 15000  # 150 руб * 100 копеек
+
+
+def test_calc_price_weight_multiplier(monkeypatch):
+    monkeypatch.setattr("web.tasks.vk_sync.settings.VK_WEIGHT_PRICE_MULTIPLIER", 10)
+    # 50 руб/г → 50 * 10 (multiplier) * 100 (kopecks) = 50000
+    assert _calc_price(Decimal("50"), "г") == 50000
+
+
+def test_calc_price_none():
+    assert _calc_price(None, "шт") == 0
+
+
+def test_calc_price_zero():
+    assert _calc_price(Decimal("0"), "шт") == 0
+
+
+# ── _name_for_vk ──────────────────────────────────────────────────────────────
+
+def test_name_replaces_semicolons():
+    assert _name_for_vk("Чай; зелёный; Китай") == "Чай, зелёный, Китай"
+
+
+def test_name_no_semicolons():
+    assert _name_for_vk("Пуэр (выдержанный)") == "Пуэр (выдержанный)"
+
+
+# ── _build_description ────────────────────────────────────────────────────────
+
+def test_build_description_weight(monkeypatch):
+    monkeypatch.setattr("web.tasks.vk_sync.settings.VK_WEIGHT_PRICE_MULTIPLIER", 10)
+    desc = _build_description("Чай", "г", None)
+    assert "10г" in desc
+    assert "Чай" in desc
+
+
+def test_build_description_with_evo_desc(monkeypatch):
+    monkeypatch.setattr("web.tasks.vk_sync.settings.VK_WEIGHT_PRICE_MULTIPLIER", 10)
+    desc = _build_description("Чай", "шт", "Вкусный чай из Китая")
+    assert "Вкусный чай из Китая" in desc
+
+
+def test_build_description_no_evo_desc(monkeypatch):
+    monkeypatch.setattr("web.tasks.vk_sync.settings.VK_WEIGHT_PRICE_MULTIPLIER", 10)
+    desc = _build_description("Чай", "шт", None)
+    assert "Чай" in desc
+
+
+# ── _delete_orphans ───────────────────────────────────────────────────────────
+
+def test_delete_orphans_removes_stale_vk_products():
+    from web.models.connections import VkCachedProduct, CachedProduct
+
+    # Build fake VK cached products
+    vk1 = MagicMock(spec=VkCachedProduct)
+    vk1.vk_product_id = "111"
+    vk1.name = "Существующий"
+
+    vk2 = MagicMock(spec=VkCachedProduct)
+    vk2.vk_product_id = "222"
+    vk2.name = "Удалённый из Эвотор"
+
+    db = MagicMock()
+    # owned_ids contains only "111" — "222" is orphan
+    owned_ids = {"111"}
+
+    # query().filter_by().filter().all() chain
+    query_mock = MagicMock()
+    query_mock.filter_by.return_value.filter.return_value.all.return_value = [vk2]
+    # second query for stale cached_products
+    query_mock.filter.return_value.all.return_value = []
+    db.query.return_value = query_mock
+
+    results = {"deleted": 0, "errors": 0}
+    mock_post_resp = {"response": 1}
+
+    with patch("web.tasks.vk_sync._vk_post", return_value=mock_post_resp):
+        _delete_orphans(db, user_id=1, vk_group_id="99", owned_ids=owned_ids,
+                        token="tok", results=results)
+
+    assert results["deleted"] == 1
+    db.delete.assert_called_once_with(vk2)
+
+
+def test_delete_orphans_vk_api_error_counted():
+    from web.models.connections import VkCachedProduct
+
+    vk1 = MagicMock(spec=VkCachedProduct)
+    vk1.vk_product_id = "999"
+    vk1.name = "Сломанный"
+
+    db = MagicMock()
+    query_mock = MagicMock()
+    query_mock.filter_by.return_value.filter.return_value.all.return_value = [vk1]
+    query_mock.filter.return_value.all.return_value = []
+    db.query.return_value = query_mock
+
+    results = {"deleted": 0, "errors": 0}
+
+    with patch("web.tasks.vk_sync._vk_post", return_value={"error": {"error_code": 15}}):
+        _delete_orphans(db, user_id=1, vk_group_id="99", owned_ids={"other"},
+                        token="tok", results=results)
+
+    assert results["deleted"] == 0
+    assert results["errors"] == 1
+
+
+def test_delete_orphans_empty_owned_ids_deletes_all():
+    """If no Evotor products exist (owned_ids empty), all VK products are orphans."""
+    from web.models.connections import VkCachedProduct
+
+    vk1 = MagicMock(spec=VkCachedProduct)
+    vk1.vk_product_id = "1"
+    vk1.name = "Лишний"
+
+    db = MagicMock()
+    query_mock = MagicMock()
+    # With empty owned_ids, query without .filter() is used
+    query_mock.filter_by.return_value.all.return_value = [vk1]
+    query_mock.filter.return_value.all.return_value = []
+    db.query.return_value = query_mock
+
+    results = {"deleted": 0, "errors": 0}
+
+    with patch("web.tasks.vk_sync._vk_post", return_value={"response": 1}):
+        _delete_orphans(db, user_id=1, vk_group_id="99", owned_ids=set(),
+                        token="tok", results=results)
+
+    assert results["deleted"] == 1