Add: Korean comments to habit_bot.py and stock_tracker.py

- Added bilingual headers with Korean descriptions
- Added Korean section comments for all major functions
- All documentation now bilingual (EN/KO)

Files updated:
- habit_bot.py
- stock_tracker.py

Added comments in Korean for:
- Configuration section
- Data models
- Habit management
- Food logging
- URL summarization
- Command handlers

habit_bot.py

@@ -1,4 +1,15 @@
 #!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# Habit #!/usr/bin/env python3 Diet Telegram Bot with URL Summarization
+# URL 요약을 포함한 습관 및 식단 Telegram 봇
+#
+# 기능 / Features:
+# - 습관 추적 (/habit add, log, list) / Habit tracking
+# - 음식 기록 및 영양 분석 / Food logging with nutrition analysis
+# - 아침 브리핑 및 밤 디브리프 / Morning briefings and night debrief
+# - URL 요약 (YouTube/Blog/News) / URL summarization
+# - 케토 다이어트 가이드라인 / Keto diet guidelines
 """
 Unified Telegram Bot - Habit, Diet, URL Summarizer
 Features: