refactor(pages): 抽取时间选择策略为 TimeSelectMaker，将 Overlay 基类更名为 Dialog

将 findBestTimeOption 中的预约/续约双分支逻辑抽象为策略模式：
- TimeOptionReader 负责从 WebElement 提取时间数据（ReserveTimeReader / RenewTimeReader）
- TimeDecisionMaker 执行纯决策算法，零 Selenium 依赖
- TimeSelectMaker 作为工厂统一创建配置好的决策器
- 共享常量 LIBRARY_CLOSE_MINS 统一收敛至 TimeSelectMaker

同时将 Overlay 基类重命名为 Dialog，SeatMapOverlay 同步更名为 SeatMapDialog，保持命名一致性。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/pages/strategies/__init__.py

@@ -0,0 +1,28 @@
+# -*- coding: utf-8 -*-
+"""
+Copyright (c) 2026 KenanZhu.
+All rights reserved.
+
+This software is provided "as is", without any warranty of any kind.
+You may use, modify, and distribute this file under the terms of the MIT License.
+See the LICENSE file for details.
+"""
+from pages.strategies.timeSelectMaker import (
+    TimeSelectMaker,
+    TimeDecisionMaker,
+    TimeOptionReader,
+    ReserveTimeReader,
+    RenewTimeReader,
+    TimeOption,
+    TimeSelectionResult,
+)
+
+__all__ = [
+    "TimeSelectMaker",
+    "TimeDecisionMaker",
+    "TimeOptionReader",
+    "ReserveTimeReader",
+    "RenewTimeReader",
+    "TimeOption",
+    "TimeSelectionResult",
+]