feat: enhance gitignore and bot prefix handling

- Updated .gitignore to properly exclude Python cache files and environment variables
- Modified bot.py to improve prefix case handling for better command recognition
- Refactored mail.py to streamline feedback email generation and database interaction
- Added environment variable loading in mail.py for better configuration management

requirements.txt

@@ -15,7 +15,7 @@ itsdangerous==2.2.0
 Jinja2==3.1.6
 MarkupSafe==3.0.3
 multidict==6.1.0
-mysql-connector==2.2.9
+mysql-connector-python>=8.1.0,<9
 pillow==12.1.1
 propcache==0.2.0
 python-dateutil==2.9.0.post0
@@ -27,4 +27,4 @@ tzdata==2024.2
 urllib3==2.2.3
 Werkzeug==3.1.7
 yarl==1.17.1
-waitress==2.2.0
+waitress==3.0.2