refactor(pages): 引入 Page Object 模式重构全部页面模块，变量统一为 snake_case

将原始 Selenium 操作脚本重构为三层 Page Object 架构：
- Page Objects（LoginPage/ReserveView/RecordsView/MainShell）
- Component Objects（Overlay 基类 + SeatMapOverlay/ReserveResultDialog 等对话框）
- Flow 状态机（ReserveFlow/CheckinFlow/RenewFlow）
- Services（CaptchaHandler/ReserveValidator/RecordChecker）

变量命名统一为 snake_case，方法名保持 camelCase，类名保持 PascalCase。

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

src/pages/MainShell.py

@@ -0,0 +1,166 @@
+# -*- 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.
+"""
+import time
+
+from selenium.webdriver.common.by import By
+from selenium.webdriver.support.ui import WebDriverWait
+from selenium.webdriver.support import expected_conditions as EC
+from selenium.webdriver.remote.webdriver import WebDriver
+from selenium.common.exceptions import (
+    NoSuchElementException,
+    TimeoutException,
+)
+
+from pages.ReserveView import ReserveView
+from pages.RecordsView import RecordsView
+
+
+class MainShell:
+
+    TAB_RESERVE  = (By.XPATH, "//a[@href='/map']")
+    TAB_HISTORY  = (By.XPATH, "//a[@href='/history?type=SEAT']")
+    TAB_LOGOUT   = (By.XPATH, "//a[@href='/logout']")
+
+    BTN_CHECKIN  = (By.ID, "btnCheckIn")
+    BTN_EXTEND   = (By.ID, "btnExtend")
+
+    def __init__(
+        self,
+        driver: WebDriver,
+    ) -> None:
+
+        self._driver = driver
+
+    def gotoReserveView(
+        self,
+    ) -> ReserveView:
+
+        self._clickTab(self.TAB_RESERVE)
+        WebDriverWait(self._driver, 2).until(
+            EC.presence_of_element_located((By.ID, "seatLayout"))
+        )
+        return ReserveView(self._driver)
+
+    def gotoRecordsView(
+        self,
+    ) -> RecordsView:
+
+        self._clickTab(self.TAB_HISTORY)
+        WebDriverWait(self._driver, 2).until(
+            EC.presence_of_element_located((By.CLASS_NAME, "myReserveList"))
+        )
+        return RecordsView(self._driver)
+
+    def logout(
+        self,
+    ) -> bool:
+
+        try:
+            self._driver.find_element(*self.TAB_LOGOUT).click()
+            return True
+        except NoSuchElementException:
+            return False
+        except Exception:
+            return False
+
+    def waitCheckinButton(
+        self,
+    ) -> bool:
+
+        try:
+            WebDriverWait(self._driver, 2).until(
+                EC.element_to_be_clickable(self.BTN_CHECKIN)
+            )
+            return True
+        except TimeoutException:
+            return False
+        except Exception:
+            return False
+
+    def waitExtendButton(
+        self,
+    ) -> bool:
+
+        try:
+            WebDriverWait(self._driver, 2).until(
+                EC.element_to_be_clickable(self.BTN_EXTEND)
+            )
+            return True
+        except TimeoutException:
+            return False
+        except Exception:
+            return False
+
+    def isCheckinButtonDisabled(
+        self,
+    ) -> bool:
+
+        btn = self._driver.find_element(*self.BTN_CHECKIN)
+        return "disabled" in btn.get_attribute("class")
+
+    def isExtendButtonDisabled(
+        self,
+    ) -> bool:
+
+        btn = self._driver.find_element(*self.BTN_EXTEND)
+        return "disabled" in btn.get_attribute("class")
+
+    def clickCheckinButton(
+        self,
+    ) -> None:
+
+        btn = WebDriverWait(self._driver, 2).until(
+            EC.element_to_be_clickable(self.BTN_CHECKIN)
+        )
+        btn.click()
+
+    def clickExtendButton(
+        self,
+    ) -> None:
+
+        btn = WebDriverWait(self._driver, 2).until(
+            EC.element_to_be_clickable(self.BTN_EXTEND)
+        )
+        btn.click()
+
+    def enableCheckinButtonByJS(
+        self,
+    ) -> bool:
+
+        script = """
+        try {
+            var checkin_btn = document.getElementById('btnCheckIn');
+            if (checkin_btn) {
+                checkin_btn.classList.remove('disabled');
+                return true;
+            }
+            return false;
+        } catch (e) {
+            return false;
+        }
+        """
+        result = self._driver.execute_script(script)
+        time.sleep(0.1)
+        return result
+
+    def refresh(
+        self,
+    ) -> None:
+
+        self._driver.refresh()
+
+    def _clickTab(
+        self,
+        locator: tuple,
+    ) -> None:
+
+        WebDriverWait(self._driver, 2).until(
+            EC.element_to_be_clickable(locator)
+        ).click()