revert: Remove bot.session implementation - Revert assistant bot to original bot_token method - Remove BOT_SESSION config variable - Remove bot session file support - Update .gitignore to allow .session files to be committed

fix: Enhanced database error handling with automatic fallback - Always try fallback to create bot without database on any error - Better error detection for database/file access issues - Added final fallback in outer exception handler - Improved logging at each step

fix: Improve database error handling for assistant bot initialization - Add error handling for database access failures - Fallback to creating bot without database if db access fails - Better error messages for database-related issues - Handle database read errors gracefully

feat: Support bot.session file and improve bot session handling - Add support for bot.session file in root/sessions directory - Prioritize bot.session file over session strings - Improve bot_session_gen.py with better error handling - Fix async send_message warning - Update config template with bot session instructions

feat: Add bot session support for assistant bot - Changed assistant bot to use BOT_SESSION instead of bot_token - Auto-generate session from bot_token if session not provided - Added BOT_SESSION config variable - Falls back to bot_token method if session creation fails

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