Add market close updates and update deployment path for Compose Manager

Bot enhancements:
- Add scheduled update at market close (4:00 PM ET on trading days)
- Implement is_trading_day() method to check weekdays/holidays
- Market close update sends PYPL price at end of trading day

Deployment changes:
- Update all scripts to use Docker Compose Manager plugin path
- New path: /boot/config/plugins/compose.manager/projects/discord-stock-bot
- Container now integrates with Unraid Docker UI Compose section
- Update documentation with plugin integration details

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

market_hours.py

@@ -79,6 +79,34 @@ class MarketHours:
             logger.debug(f"Market closed: Outside trading hours ({current_time})")
             return False
 
+    @classmethod
+    def is_trading_day(cls, check_time: datetime = None) -> bool:
+        """
+        Determine if the given date is a trading day (weekday, not a holiday).
+
+        Args:
+            check_time: Datetime to check (defaults to now)
+
+        Returns:
+            True if it's a trading day, False otherwise
+        """
+        if check_time is None:
+            check_time = datetime.now(cls.NYSE_TIMEZONE)
+        else:
+            check_time = check_time.astimezone(cls.NYSE_TIMEZONE)
+
+        # Check if weekend
+        if check_time.weekday() >= 5:  # Saturday = 5, Sunday = 6
+            return False
+
+        # Check if holiday
+        check_date = check_time.date()
+        all_holidays = cls.HOLIDAYS_2024 + cls.HOLIDAYS_2025
+        if any(holiday.date() == check_date for holiday in all_holidays):
+            return False
+
+        return True
+
     @classmethod
     def get_next_market_open(cls, from_time: datetime = None) -> datetime:
         """