feat(bot_notifier, browser_automation): Add debug screenshot capability and improve browser automation

- Add `_send_photo_to_all()` async method to send photos to all admin chat IDs
- Add `send_screenshot()` async method for sending debug screenshots via Telegram
- Add `send_screenshot_sync()` synchronous wrapper for non-async code integration
- Add `save_debug_screenshot()` function to capture and send screenshots when DEBUG_SCREENSHOT=true
- Add debug screenshot directory creation and timestamp-based file naming
- Improve browser initialization with automation detection bypass and realistic User-Agent
- Add `--disable-blink-features=AutomationControlled` flag to hide automation characteristics
- Set Mozilla/5.0 User-Agent string to mimic real Chrome browser
- Enhance OpenAI account registration flow with better error handling and debugging
- Add screenshot capture on page load failures and popup abnormalities
- Improve popup detection with additional CSS and text selectors for better reliability
- Increase timeout values for popup loading and form detection (1-3s to 2-5s)
- Add multiple fallback selectors for login form detection (email input fields, welcome text)
- Improve signup button retry logic with longer wait times and additional selector options
- Add screenshot capture on critical failures (popup retry failed, signup button not found)

bot_notifier.py

@@ -200,6 +200,26 @@ class BotNotifier:
             except TelegramError:
                 pass
 
+    async def _send_photo_to_all(self, photo_path: str, caption: str = ""):
+        """发送图片到所有管理员"""
+        for chat_id in self.chat_ids:
+            try:
+                with open(photo_path, 'rb') as photo:
+                    await self.bot.send_photo(
+                        chat_id=chat_id,
+                        photo=photo,
+                        caption=caption,
+                        parse_mode="HTML"
+                    )
+            except TelegramError:
+                pass
+            except FileNotFoundError:
+                pass
+
+    async def send_screenshot(self, photo_path: str, caption: str = ""):
+        """发送调试截图"""
+        await self._send_photo_to_all(photo_path, caption)
+
     def queue_message(self, message: str, level: str = "info"):
         """将消息加入发送队列 (非阻塞)"""
         if self._message_queue:
@@ -292,6 +312,16 @@ def notify_sync(message: str, level: str = "info"):
         _notifier.queue_message(message, level)
 
 
+def send_screenshot_sync(photo_path: str, caption: str = ""):
+    """同步方式发送截图 (供非异步代码使用)"""
+    if _notifier and _notifier._loop:
+        import asyncio
+        asyncio.run_coroutine_threadsafe(
+            _notifier.send_screenshot(photo_path, caption),
+            _notifier._loop
+        )
+
+
 # ==================== 进度更新接口 (供 run.py 使用) ====================
 
 def progress_start(team_name: str, total: int) -> Optional[ProgressTracker]: