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

.gitignore

@@ -1,5 +1,5 @@
 # Byte-compiled / optimized / DLL files
-*__pycache__/
+__pycache__/
 *.py[cod]
 *$py.class
 
@@ -7,10 +7,12 @@
 venv/
 env/
 ENV/
+.venv/
 
 # Environment variables
 .env
 .env.local
+.env.*.local
 
 # IDE
 .vscode/
@@ -27,6 +29,7 @@ config.json
 token.txt
 logs/
 *.log
+*.log.*
 
 # Database
 *.db
@@ -41,3 +44,18 @@ logs/
 # Cache files
 *.cache
 __pycache__/
+
+# Python
+*.pyc
+.pytest_cache/
+.coverage
+.pytest_cache/
+.mypy_cache/
+
+# Web interface
+web/static/uploads/
+web/static/cache/
+
+# System
+.DS_Store
+._*